refactor: universe and objects now use fast list

They still do generate a lot of garbage but with boxed value pools I made the boxes reusable, it still does generate garbage through the delegate creation, gotta find a solution for them later

Engine.Core/ActiveBehaviourCollectorSorted.cs

@@ -1,67 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace Engine.Core;
-
-public class ActiveBehaviourCollectorSorted<T> : ActiveBehaviourCollector<T> where T : class, IBehaviour
-{
-    private readonly Event<IBehaviour, IBehaviour.PriorityChangedArguments>.EventHandler delegateOnPriorityChanged = null!;
-
-    private IComparer<T>? _sortBy = null;
-    public IComparer<T>? SortBy
-    {
-        get => _sortBy;
-        set
-        {
-            _sortBy = value;
-
-            if (value is not null)
-                activeBehaviours.Sort(value);
-        }
-    }
-
-    protected override void AddBehaviour(T behaviour)
-    {
-        if (SortBy is null)
-        {
-            activeBehaviours.Add(behaviour);
-            return;
-        }
-
-        int insertionIndex = activeBehaviours.BinarySearch(behaviour, SortBy);
-
-        if (insertionIndex < 0)
-            insertionIndex = ~insertionIndex;
-
-        activeBehaviours.Insert(insertionIndex, behaviour);
-    }
-
-    protected override void OnBehaviourAdd(IBehaviour behaviour)
-    {
-        behaviour.OnPriorityChanged.AddListener(delegateOnPriorityChanged);
-    }
-
-    protected override void OnBehaviourRemove(IBehaviour behaviour)
-    {
-        behaviour.OnPriorityChanged.RemoveListener(delegateOnPriorityChanged);
-    }
-
-    private void OnPriorityChanged(IBehaviour sender, IBehaviour.PriorityChangedArguments args)
-    {
-        T behaviour = (T)sender;
-        activeBehaviours.Remove(behaviour);
-        AddBehaviour(behaviour);
-    }
-
-    public ActiveBehaviourCollectorSorted()
-    {
-        delegateOnPriorityChanged = OnPriorityChanged;
-    }
-
-    public ActiveBehaviourCollectorSorted(IUniverse universe, Comparison<T> sortBy) : base(universe)
-    {
-        delegateOnPriorityChanged = OnPriorityChanged;
-
-        SortBy = Comparer<T>.Create(sortBy);
-    }
-}

Engine.Core/BehaviourCollectorSorted.cs

@@ -1,67 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace Engine.Core;
-
-public class BehaviourCollectorSorted<T> : BehaviourCollector<T> where T : class
-{
-    private readonly Event<IBehaviour, IBehaviour.PriorityChangedArguments>.EventHandler delegateOnPriorityChanged = null!;
-
-    private IComparer<T>? _sortBy = null;
-    public IComparer<T>? SortBy
-    {
-        get => _sortBy;
-        set
-        {
-            _sortBy = value;
-
-            if (value is not null)
-                behaviours.Sort(value);
-        }
-    }
-
-    protected override void AddBehaviour(T behaviour)
-    {
-        if (SortBy is null)
-        {
-            behaviours.Add(behaviour);
-            return;
-        }
-
-        int insertionIndex = behaviours.BinarySearch(behaviour, SortBy);
-
-        if (insertionIndex < 0)
-            insertionIndex = ~insertionIndex;
-
-        behaviours.Insert(insertionIndex, behaviour);
-    }
-
-    protected override void OnBehaviourAdd(IBehaviour behaviour)
-    {
-        behaviour.OnPriorityChanged.AddListener(delegateOnPriorityChanged);
-    }
-
-    protected override void OnBehaviourRemove(IBehaviour behaviour)
-    {
-        behaviour.OnPriorityChanged.RemoveListener(delegateOnPriorityChanged);
-    }
-
-    private void OnPriorityChanged(IBehaviour sender, IBehaviour.PriorityChangedArguments args)
-    {
-        T behaviour = (T)sender;
-        behaviours.Remove(behaviour);
-        AddBehaviour(behaviour);
-    }
-
-    public BehaviourCollectorSorted()
-    {
-        delegateOnPriorityChanged = OnPriorityChanged;
-    }
-
-    public BehaviourCollectorSorted(IUniverse universe, Comparison<T> sortBy) : base(universe)
-    {
-        delegateOnPriorityChanged = OnPriorityChanged;
-
-        SortBy = Comparer<T>.Create(sortBy);
-    }
-}

Engine.Core/BehaviourController.cs

@@ -10,7 +10,7 @@ public class BehaviourController : BaseEntity, IBehaviourController
     public Event<IBehaviourController, IBehaviourController.BehaviourRemovedArguments> OnBehaviourRemoved { get; } = new();
     public Event<IHasUniverseObject> OnUniverseObjectAssigned { get; } = new();
 
-    private readonly List<IBehaviour> behaviours = new(Constants.BEHAVIOURS_SIZE_INITIAL);
+    private readonly FastList<IBehaviour> behaviours = new(Constants.BEHAVIOURS_SIZE_INITIAL);
 
     private IUniverseObject _universeObject = null!;
 

Engine.Core/Collectors/ActiveBehaviourCollector.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Engine.Core;
+
+public class ActiveBehaviourCollector<T> : ActiveBehaviourCollectorBase<T> where T : class, IBehaviour
+{
+    protected readonly FastList<T> activeBehaviours = new(32);
+    public override T this[Index index] => activeBehaviours[index];
+    public override int Count => activeBehaviours.Count;
+
+    public ActiveBehaviourCollector() { }
+    public ActiveBehaviourCollector(IUniverse universe) : base(universe) { }
+
+    protected override void AddBehaviour(T behaviour) => activeBehaviours.Add(behaviour);
+    protected override bool RemoveBehaviour(T tBehaviour) => activeBehaviours.Remove(tBehaviour);
+}

Engine.Core/Collectors/ActiveBehaviourCollectorBase.cs

@@ -3,12 +3,10 @@ using System.Collections.Generic;
 
 namespace Engine.Core;
 
-public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : class, IBehaviour
+public abstract class ActiveBehaviourCollectorBase<T> : IBehaviourCollector<T> where T : class, IBehaviour
 {
-    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourCollectedArguments> OnCollected { get; } = new();
-    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourRemovedArguments> OnRemoved { get; } = new();
-    public Event<IHasUniverse> OnUniverseAssigned { get; } = new();
-    public Event<IAssignable>? OnUnassigned { get; } = new();
+    protected readonly Dictionary<IActive, T> monitoringActiveToBehaviour = new(32);
+    protected readonly FastList<T> monitoringBehaviours = new(32);
 
     private readonly Event<IBehaviourController, IBehaviourController.BehaviourAddedArguments>.EventHandler delegateOnBehaviourAdded = null!;
     private readonly Event<IBehaviourController, IBehaviourController.BehaviourRemovedArguments>.EventHandler delegateOnBehaviourRemoved = null!;
@@ -16,80 +14,16 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
     private readonly Event<IUniverse, IUniverse.UniverseObjectRegisteredArguments>.EventHandler delegateOnUniverseObjectRegistered = null!;
     private readonly Event<IUniverse, IUniverse.UniverseObjectUnRegisteredArguments>.EventHandler delegateOnUniverseObjectUnregistered = null!;
 
-    private readonly List<T> monitoringBehaviours = new(32);
-    protected readonly List<T> activeBehaviours = new(32);
-    protected readonly Dictionary<IActive, T> monitoringActiveToBehaviour = new(32);
+    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourCollectedArguments> OnCollected { get; } = new();
+    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourRemovedArguments> OnRemoved { get; } = new();
+    public Event<IHasUniverse> OnUniverseAssigned { get; } = new();
+    public Event<IAssignable>? OnUnassigned { get; } = new();
 
+    public abstract int Count { get; }
+
+    public abstract T this[Index index] { get; }
     public IUniverse Universe { get; private set; } = null!;
 
-    private void OnUniverseObjectRegistered(IUniverse manager, IUniverse.UniverseObjectRegisteredArguments args)
-    {
-        IUniverseObject universeObject = args.UniverseObjectRegistered;
-
-        universeObject.BehaviourController.OnBehaviourAdded.AddListener(delegateOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(delegateOnBehaviourRemoved);
-
-        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
-            OnBehaviourAdded(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
-    }
-
-    private void OnUniverseObjectUnregistered(IUniverse manager, IUniverse.UniverseObjectUnRegisteredArguments args)
-    {
-        IUniverseObject universeObject = args.UniverseObjectUnregistered;
-
-        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(delegateOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(delegateOnBehaviourRemoved);
-
-        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
-            OnBehaviourRemoved(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
-    }
-
-    protected virtual void OnBehaviourAdd(IBehaviour behaviour) { }
-    private void OnBehaviourAdded(IBehaviourController controller, IBehaviourController.BehaviourAddedArguments args)
-    {
-        if (args.BehaviourAdded is not T tBehaviour)
-            return;
-
-        monitoringBehaviours.Add(tBehaviour);
-        monitoringActiveToBehaviour.Add(tBehaviour, tBehaviour);
-        tBehaviour.OnActiveChanged.AddListener(delegateOnBehaviourStateChanged);
-        OnBehaviourStateChanged(tBehaviour, new(!tBehaviour.IsActive));
-    }
-
-    protected virtual void AddBehaviour(T behaviour) => activeBehaviours.Add(behaviour);
-    private void OnBehaviourStateChanged(IActive sender, IActive.ActiveChangedArguments args)
-    {
-        T behaviour = monitoringActiveToBehaviour[sender];
-        if (sender.IsActive)
-        {
-            AddBehaviour(behaviour);
-            OnBehaviourAdd(behaviour);
-            OnCollected?.Invoke(this, new(behaviour));
-        }
-        else if (activeBehaviours.Remove(behaviour))
-        {
-            OnBehaviourRemove(behaviour);
-            OnRemoved?.Invoke(this, new(behaviour));
-        }
-    }
-
-    protected virtual void OnBehaviourRemove(IBehaviour behaviour) { }
-    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviourController.BehaviourRemovedArguments args)
-    {
-        if (args.BehaviourRemoved is not T tBehaviour)
-            return;
-
-        if (!monitoringBehaviours.Remove(tBehaviour) || !monitoringActiveToBehaviour.Remove(tBehaviour))
-            return;
-
-        tBehaviour.OnActiveChanged.RemoveListener(delegateOnBehaviourStateChanged);
-        if (activeBehaviours.Remove(tBehaviour))
-        {
-            OnBehaviourRemove(tBehaviour);
-            OnRemoved?.Invoke(this, new(tBehaviour));
-        }
-    }
-
     public bool Assign(IUniverse universe)
     {
         if (Universe is not null)
@@ -123,10 +57,75 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
         return true;
     }
 
-    public int Count => activeBehaviours.Count;
-    public T this[Index index] => activeBehaviours[index];
+    protected abstract void AddBehaviour(T behaviour);
+    protected virtual void OnBehaviourAdd(IBehaviour behaviour) { }
+    private void OnBehaviourAdded(IBehaviourController controller, IBehaviourController.BehaviourAddedArguments args)
+    {
+        if (args.BehaviourAdded is not T tBehaviour)
+            return;
 
-    public ActiveBehaviourCollector()
+        monitoringBehaviours.Add(tBehaviour);
+        monitoringActiveToBehaviour.Add(tBehaviour, tBehaviour);
+        tBehaviour.OnActiveChanged.AddListener(delegateOnBehaviourStateChanged);
+        OnBehaviourStateChanged(tBehaviour, new(!tBehaviour.IsActive));
+    }
+
+    protected abstract bool RemoveBehaviour(T behaviour);
+    protected virtual void OnBehaviourRemove(IBehaviour behaviour) { }
+    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviourController.BehaviourRemovedArguments args)
+    {
+        if (args.BehaviourRemoved is not T tBehaviour)
+            return;
+
+        if (!monitoringBehaviours.Remove(tBehaviour) || !monitoringActiveToBehaviour.Remove(tBehaviour))
+            return;
+
+        tBehaviour.OnActiveChanged.RemoveListener(delegateOnBehaviourStateChanged);
+        if (!RemoveBehaviour(tBehaviour))
+            return;
+
+        OnBehaviourRemove(tBehaviour);
+        OnRemoved?.Invoke(this, new(tBehaviour));
+    }
+    private void OnBehaviourStateChanged(IActive sender, IActive.ActiveChangedArguments args)
+    {
+        T behaviour = monitoringActiveToBehaviour[sender];
+        if (sender.IsActive)
+        {
+            AddBehaviour(behaviour);
+            OnBehaviourAdd(behaviour);
+            OnCollected?.Invoke(this, new(behaviour));
+        }
+        else if (RemoveBehaviour(behaviour))
+        {
+            OnBehaviourRemove(behaviour);
+            OnRemoved?.Invoke(this, new(behaviour));
+        }
+    }
+
+    private void OnUniverseObjectRegistered(IUniverse manager, IUniverse.UniverseObjectRegisteredArguments args)
+    {
+        IUniverseObject universeObject = args.UniverseObjectRegistered;
+
+        universeObject.BehaviourController.OnBehaviourAdded.AddListener(delegateOnBehaviourAdded);
+        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(delegateOnBehaviourRemoved);
+
+        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
+            OnBehaviourAdded(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
+    }
+
+    private void OnUniverseObjectUnregistered(IUniverse manager, IUniverse.UniverseObjectUnRegisteredArguments args)
+    {
+        IUniverseObject universeObject = args.UniverseObjectUnregistered;
+
+        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(delegateOnBehaviourAdded);
+        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(delegateOnBehaviourRemoved);
+
+        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
+            OnBehaviourRemoved(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
+    }
+
+    public ActiveBehaviourCollectorBase()
     {
         delegateOnBehaviourAdded = OnBehaviourAdded;
         delegateOnBehaviourRemoved = OnBehaviourRemoved;
@@ -135,7 +134,7 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
         delegateOnUniverseObjectUnregistered = OnUniverseObjectUnregistered;
     }
 
-    public ActiveBehaviourCollector(IUniverse universe)
+    public ActiveBehaviourCollectorBase(IUniverse universe)
     {
         delegateOnBehaviourAdded = OnBehaviourAdded;
         delegateOnBehaviourRemoved = OnBehaviourRemoved;

Engine.Core/Collectors/ActiveBehaviourCollectorOrdered.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+
+namespace Engine.Core;
+
+public class ActiveBehaviourCollectorOrdered<TIndex, TItem> : ActiveBehaviourCollector<TItem> where TItem : class, IBehaviour where TIndex : IComparable
+{
+    private readonly Event<IBehaviour, IBehaviour.PriorityChangedArguments>.EventHandler delegateOnPriorityChanged = null!;
+
+    private readonly SortedDictionary<TIndex, FastList<TItem>> behaviours = null!;
+
+    private readonly Func<TItem, TIndex> getIndexFunc = null!;
+    private readonly IComparer<TIndex> sortBy = null!;
+
+    private int count = 0;
+    public override int Count => count;
+
+    public override TItem this[Index index]
+    {
+        get
+        {
+            int actualIndex = index.IsFromEnd
+                ? count - index.Value
+                : index.Value;
+
+            if (actualIndex < 0 || actualIndex >= count)
+                throw new IndexOutOfRangeException();
+
+            int leftIndex = actualIndex;
+            foreach ((TIndex i, FastList<TItem> list) in behaviours)
+            {
+                if (leftIndex < list.Count)
+                    return list[leftIndex];
+                leftIndex -= list.Count;
+            }
+            throw new IndexOutOfRangeException();
+        }
+    }
+
+    protected override bool RemoveBehaviour(TItem tBehaviour)
+    {
+        TIndex index = getIndexFunc(tBehaviour);
+        if (!behaviours.TryGetValue(index, out FastList<TItem>? list))
+            throw new Exceptions.NotFoundException($"Index of '{index}' is not found in the collector");
+
+        if (!list.Remove(tBehaviour))
+            return false;
+
+        count--;
+        return true;
+    }
+
+    protected override void AddBehaviour(TItem behaviour)
+    {
+        TIndex key = getIndexFunc(behaviour);
+        if (!behaviours.TryGetValue(key, out FastList<TItem>? list))
+            behaviours[key] = list = [];
+
+        count++;
+        list.Add(behaviour);
+    }
+
+    protected override void OnBehaviourAdd(IBehaviour behaviour) => behaviour.OnPriorityChanged.AddListener(delegateOnPriorityChanged);
+    protected override void OnBehaviourRemove(IBehaviour behaviour) => behaviour.OnPriorityChanged.RemoveListener(delegateOnPriorityChanged);
+
+    private void OnPriorityChanged(IBehaviour sender, IBehaviour.PriorityChangedArguments args)
+    {
+        TItem behaviour = (TItem)sender;
+        RemoveBehaviour(behaviour);
+        AddBehaviour(behaviour);
+    }
+
+    public ActiveBehaviourCollectorOrdered(Func<TItem, TIndex> getIndexFunc, Comparison<TIndex> sortBy)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = Comparer<TIndex>.Create(sortBy);
+        behaviours = new(this.sortBy);
+    }
+
+    public ActiveBehaviourCollectorOrdered(IUniverse universe, Func<TItem, TIndex> getIndexFunc, Comparison<TIndex> sortBy) : base(universe)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = Comparer<TIndex>.Create(sortBy);
+        behaviours = new(this.sortBy);
+    }
+
+    public ActiveBehaviourCollectorOrdered(Func<TItem, TIndex> getIndexFunc, IComparer<TIndex> sortBy)
+    {
+        this.getIndexFunc = getIndexFunc;
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.sortBy = sortBy;
+        behaviours = new(sortBy);
+    }
+
+    public ActiveBehaviourCollectorOrdered(IUniverse universe, Func<TItem, TIndex> getIndexFunc, IComparer<TIndex> sortBy) : base(universe)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = sortBy;
+        behaviours = new(sortBy);
+    }
+}

Engine.Core/Collectors/BehaviourCollector.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Engine.Core;
+
+public class BehaviourCollector<T> : BehaviourCollectorBase<T> where T : class
+{
+    protected readonly FastList<T> behaviours = new(32);
+
+    public override T this[Index index] => behaviours[index];
+    public override int Count => behaviours.Count;
+
+    protected override void AddBehaviour(T behaviour) => behaviours.Add(behaviour);
+    protected override bool RemoveBehaviour(T tBehaviour) => behaviours.Remove(tBehaviour);
+
+    public BehaviourCollector() { }
+    public BehaviourCollector(IUniverse universe) : base(universe) { }
+}

Engine.Core/Collectors/BehaviourCollectorBase.cs

@@ -1,72 +1,25 @@
 using System;
-using System.Collections.Generic;
 
 namespace Engine.Core;
 
-public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
+public abstract class BehaviourCollectorBase<T> : IBehaviourCollector<T> where T : class
 {
-    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourCollectedArguments> OnCollected { get; } = new();
-    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourRemovedArguments> OnRemoved { get; } = new();
-    public Event<IHasUniverse> OnUniverseAssigned { get; } = new();
-    public Event<IAssignable>? OnUnassigned { get; } = new();
-
     private readonly Event<IBehaviourController, IBehaviourController.BehaviourAddedArguments>.EventHandler delegateOnBehaviourAdded = null!;
     private readonly Event<IBehaviourController, IBehaviourController.BehaviourRemovedArguments>.EventHandler delegateOnBehaviourRemoved = null!;
     private readonly Event<IUniverse, IUniverse.UniverseObjectRegisteredArguments>.EventHandler delegateOnUniverseObjectRegistered = null!;
     private readonly Event<IUniverse, IUniverse.UniverseObjectUnRegisteredArguments>.EventHandler delegateOnUniverseObjectUnregistered = null!;
 
-    protected readonly List<T> behaviours = new(32);
+    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourCollectedArguments> OnCollected { get; } = new();
+    public Event<IBehaviourCollector<T>, IBehaviourCollector<T>.BehaviourRemovedArguments> OnRemoved { get; } = new();
+    public Event<IHasUniverse> OnUniverseAssigned { get; } = new();
+    public Event<IAssignable>? OnUnassigned { get; } = new();
 
     public IUniverse Universe { get; private set; } = null!;
 
-    private void OnUniverseObjectRegistered(IUniverse manager, IUniverse.UniverseObjectRegisteredArguments args)
-    {
-        IUniverseObject universeObject = args.UniverseObjectRegistered;
+    public abstract int Count { get; }
 
-        universeObject.BehaviourController.OnBehaviourAdded.AddListener(delegateOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(delegateOnBehaviourRemoved);
+    public abstract T this[Index index] { get; }
 
-        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
-            OnBehaviourAdded(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
-    }
-
-    private void OnUniverseObjectUnregistered(IUniverse manager, IUniverse.UniverseObjectUnRegisteredArguments args)
-    {
-        IUniverseObject universeObject = args.UniverseObjectUnregistered;
-
-        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(delegateOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(delegateOnBehaviourRemoved);
-
-        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
-            OnBehaviourRemoved(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
-    }
-
-    protected virtual void AddBehaviour(T behaviour) => behaviours.Add(behaviour);
-    protected virtual void OnBehaviourAdd(IBehaviour behaviour) { }
-    private void OnBehaviourAdded(IBehaviourController controller, IBehaviourController.BehaviourAddedArguments args)
-    {
-        if (args.BehaviourAdded is not T tBehaviour)
-            return;
-
-        AddBehaviour(tBehaviour);
-        OnBehaviourAdd(args.BehaviourAdded);
-        OnCollected?.Invoke(this, new(tBehaviour));
-    }
-
-    protected virtual void OnBehaviourRemove(IBehaviour behaviour) { }
-    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviourController.BehaviourRemovedArguments args)
-    {
-        if (args.BehaviourRemoved is not T tBehaviour)
-            return;
-
-        if (!behaviours.Remove(tBehaviour))
-            return;
-
-        OnBehaviourRemove(args.BehaviourRemoved);
-        OnRemoved?.Invoke(this, new(tBehaviour));
-    }
-
-    protected virtual void OnAssign(IUniverse universe) { }
     public bool Assign(IUniverse universe)
     {
         if (Universe is not null)
@@ -101,10 +54,57 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
         return true;
     }
 
-    public int Count => behaviours.Count;
-    public T this[Index index] => behaviours[index];
+    protected virtual void OnAssign(IUniverse universe) { }
 
-    public BehaviourCollector()
+    protected abstract void AddBehaviour(T behaviour);
+    protected virtual void OnBehaviourAdd(IBehaviour behaviour) { }
+    private void OnBehaviourAdded(IBehaviourController controller, IBehaviourController.BehaviourAddedArguments args)
+    {
+        if (args.BehaviourAdded is not T tBehaviour)
+            return;
+
+        AddBehaviour(tBehaviour);
+        OnBehaviourAdd(args.BehaviourAdded);
+        OnCollected?.Invoke(this, new(tBehaviour));
+    }
+
+    protected abstract bool RemoveBehaviour(T tBehaviour);
+    protected virtual void OnBehaviourRemove(IBehaviour behaviour) { }
+    private void OnBehaviourRemoved(IBehaviourController controller, IBehaviourController.BehaviourRemovedArguments args)
+    {
+        if (args.BehaviourRemoved is not T tBehaviour)
+            return;
+
+        if (!RemoveBehaviour(tBehaviour))
+            return;
+
+        OnBehaviourRemove(args.BehaviourRemoved);
+        OnRemoved?.Invoke(this, new(tBehaviour));
+    }
+
+    private void OnUniverseObjectRegistered(IUniverse manager, IUniverse.UniverseObjectRegisteredArguments args)
+    {
+        IUniverseObject universeObject = args.UniverseObjectRegistered;
+
+        universeObject.BehaviourController.OnBehaviourAdded.AddListener(delegateOnBehaviourAdded);
+        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(delegateOnBehaviourRemoved);
+
+        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
+            OnBehaviourAdded(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
+    }
+
+    private void OnUniverseObjectUnregistered(IUniverse manager, IUniverse.UniverseObjectUnRegisteredArguments args)
+    {
+        IUniverseObject universeObject = args.UniverseObjectUnregistered;
+
+        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(delegateOnBehaviourAdded);
+        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(delegateOnBehaviourRemoved);
+
+        for (int i = 0; i < universeObject.BehaviourController.Count; i++)
+            OnBehaviourRemoved(universeObject.BehaviourController, new(universeObject.BehaviourController[i]));
+    }
+
+    public BehaviourCollectorBase()
     {
         delegateOnBehaviourAdded = OnBehaviourAdded;
         delegateOnBehaviourRemoved = OnBehaviourRemoved;
@@ -112,7 +112,7 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
         delegateOnUniverseObjectUnregistered = OnUniverseObjectUnregistered;
     }
 
-    public BehaviourCollector(IUniverse universe)
+    public BehaviourCollectorBase(IUniverse universe)
     {
         delegateOnBehaviourAdded = OnBehaviourAdded;
         delegateOnBehaviourRemoved = OnBehaviourRemoved;

Engine.Core/Collectors/BehaviourCollectorOrdered.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+
+namespace Engine.Core;
+
+public class BehaviourCollectorOrdered<TIndex, TItem> : BehaviourCollectorBase<TItem> where TItem : class where TIndex : IComparable
+{
+    private readonly Event<IBehaviour, IBehaviour.PriorityChangedArguments>.EventHandler delegateOnPriorityChanged = null!;
+
+    private readonly SortedDictionary<TIndex, FastList<TItem>> behaviours = null!;
+
+    private readonly Func<TItem, TIndex> getIndexFunc = null!;
+    private readonly IComparer<TIndex> sortBy = null!;
+
+    private int count = 0;
+    public override int Count => count;
+
+    public override TItem this[Index index]
+    {
+        get
+        {
+            int actualIndex = index.IsFromEnd
+                ? count - index.Value
+                : index.Value;
+
+            if (actualIndex < 0 || actualIndex >= count)
+                throw new IndexOutOfRangeException();
+
+            int leftIndex = actualIndex;
+            foreach ((TIndex i, FastList<TItem> list) in behaviours)
+            {
+                if (leftIndex < list.Count)
+                    return list[leftIndex];
+                leftIndex -= list.Count;
+            }
+            throw new IndexOutOfRangeException();
+        }
+    }
+
+    protected override bool RemoveBehaviour(TItem tBehaviour)
+    {
+        TIndex index = getIndexFunc(tBehaviour);
+        if (!behaviours.TryGetValue(index, out FastList<TItem>? list))
+            throw new Exceptions.NotFoundException($"Index of '{index}' is not found in the collector");
+
+        if (!list.Remove(tBehaviour))
+            return false;
+
+        count--;
+        return true;
+    }
+
+    protected override void AddBehaviour(TItem behaviour)
+    {
+        TIndex key = getIndexFunc(behaviour);
+        if (!behaviours.TryGetValue(key, out FastList<TItem>? list))
+            behaviours[key] = list = [];
+
+        count++;
+        list.Add(behaviour);
+    }
+
+    protected override void OnBehaviourAdd(IBehaviour behaviour) => behaviour.OnPriorityChanged.AddListener(delegateOnPriorityChanged);
+    protected override void OnBehaviourRemove(IBehaviour behaviour) => behaviour.OnPriorityChanged.RemoveListener(delegateOnPriorityChanged);
+
+    private void OnPriorityChanged(IBehaviour sender, IBehaviour.PriorityChangedArguments args)
+    {
+        TItem behaviour = (TItem)sender;
+        RemoveBehaviour(behaviour);
+        AddBehaviour(behaviour);
+    }
+
+    public BehaviourCollectorOrdered(Func<TItem, TIndex> getIndexFunc, Comparison<TIndex> sortBy)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = Comparer<TIndex>.Create(sortBy);
+        behaviours = new(this.sortBy);
+    }
+
+    public BehaviourCollectorOrdered(IUniverse universe, Func<TItem, TIndex> getIndexFunc, Comparison<TIndex> sortBy) : base(universe)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = Comparer<TIndex>.Create(sortBy);
+        behaviours = new(this.sortBy);
+    }
+
+    public BehaviourCollectorOrdered(Func<TItem, TIndex> getIndexFunc, IComparer<TIndex> sortBy)
+    {
+        this.getIndexFunc = getIndexFunc;
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.sortBy = sortBy;
+        behaviours = new(sortBy);
+    }
+
+    public BehaviourCollectorOrdered(IUniverse universe, Func<TItem, TIndex> getIndexFunc, IComparer<TIndex> sortBy) : base(universe)
+    {
+        delegateOnPriorityChanged = OnPriorityChanged;
+        this.getIndexFunc = getIndexFunc;
+        this.sortBy = sortBy;
+        behaviours = new(sortBy);
+    }
+}

Engine.Core/Helpers/FastList.cs

@@ -0,0 +1,78 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Engine.Core;
+
+public class FastList<T> : IList<T>, IReadOnlyList<T>, IEnumerable<T> where T : notnull
+{
+    private readonly List<T> items = [];
+    private readonly Dictionary<T, int> indexMap = [];
+
+    public int Count => items.Count;
+
+    public bool IsReadOnly { get; set; } = false;
+    public T this[int index] { get => items[index]; set => items[index] = value; }
+
+    public void Add(T item)
+    {
+        indexMap[item] = items.Count;
+        items.Add(item);
+    }
+
+    public void RemoveAt(int i) => Remove(items[i], i);
+    public bool Remove(T item)
+    {
+        if (!indexMap.TryGetValue(item, out int index))
+            return false;
+
+        Remove(item, index);
+
+        return true;
+    }
+
+    private void Remove(T item, int index)
+    {
+        int lastIndex = items.Count - 1;
+        T lastItem = items[lastIndex];
+
+        items[index] = lastItem;
+        indexMap[lastItem] = index;
+
+        items.RemoveAt(lastIndex);
+        indexMap.Remove(item);
+    }
+
+    public void Insert(int index, T item)
+    {
+        items.Insert(index, item);
+
+        for (int i = index; i < items.Count; i++)
+            indexMap[items[i]] = i;
+    }
+
+    public void Clear()
+    {
+        items.Clear();
+        indexMap.Clear();
+    }
+
+    public bool Contains(T item) => indexMap.ContainsKey(item);
+
+    public int BinarySearch(T item, IComparer<T>? comparer = null) => items.BinarySearch(item, comparer);
+    public void Sort(IComparer<T> comparer)
+    {
+        items.Sort(comparer);
+
+        for (int i = 0; i < items.Count; i++)
+            indexMap[items[i]] = i;
+    }
+
+    public int IndexOf(T item) => items.IndexOf(item);
+    public void CopyTo(T[] array, int arrayIndex) => items.CopyTo(array, arrayIndex);
+
+    public IEnumerator<T> GetEnumerator() => items.GetEnumerator();
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public FastList() { }
+    public FastList(int count) { items.Capacity = count; }
+}

Engine.Core/Helpers/Pool.cs

@@ -10,22 +10,25 @@ public class Pool<T> : IPool<T>
 
     private readonly Func<T> generator = null!;
     private readonly Queue<T> queue = new();
+    private readonly HashSet<T> queuedHashes = [];
 
     public T Get()
     {
         if (!queue.TryDequeue(out T? result))
             result = generator();
 
+        queuedHashes.Remove(result);
         OnRemoved?.Invoke(this, result);
         return result;
     }
 
     public void Return(T item)
     {
-        if (queue.Contains(item))
+        if (queuedHashes.Contains(item))
             return;
 
         queue.Enqueue(item);
+        queuedHashes.Add(item);
         OnReturned?.Invoke(this, item);
     }
 

Engine.Core/Systems/DrawManager.cs

@@ -5,11 +5,12 @@ namespace Engine.Core;
 public class DrawManager : Behaviour
 {
     // We use Descending order because draw calls are running from last to first
-    private static Comparer<IBehaviour> SortByDescendingPriority() => Comparer<IBehaviour>.Create((x, y) => y.Priority.CompareTo(x.Priority));
+    private static Comparer<int> SortByDescendingPriority() => Comparer<int>.Create((x, y) => y.CompareTo(x));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
-    private readonly ActiveBehaviourCollectorSorted<IPreDraw> preDrawEntities = new() { SortBy = SortByDescendingPriority() };
-    private readonly ActiveBehaviourCollectorSorted<IDraw> drawEntities = new() { SortBy = SortByDescendingPriority() };
-    private readonly ActiveBehaviourCollectorSorted<IPostDraw> postDrawEntities = new() { SortBy = SortByDescendingPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, IPreDraw> preDrawEntities = new(GetPriority(), SortByDescendingPriority());
+    private readonly ActiveBehaviourCollectorOrdered<int, IDraw> drawEntities = new(GetPriority(), SortByDescendingPriority());
+    private readonly ActiveBehaviourCollectorOrdered<int, IPostDraw> postDrawEntities = new(GetPriority(), SortByDescendingPriority());
 
     private void OnPreDraw(IUniverse sender)
     {

Engine.Core/Systems/UniverseEntranceManager.cs

@@ -5,10 +5,11 @@ namespace Engine.Core;
 public class UniverseEntranceManager : Behaviour
 {
     // We use Ascending order because we are using reverse for loop to call them
-    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+    private static Comparer<int> SortByAscendingPriority() => Comparer<int>.Create((x, y) => x.CompareTo(y));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
-    private readonly ActiveBehaviourCollectorSorted<IEnterUniverse> enterUniverses = new() { SortBy = SortByAscendingPriority() };
-    private readonly ActiveBehaviourCollectorSorted<IExitUniverse> exitUniverses = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, IEnterUniverse> enterUniverses = new(GetPriority(), SortByAscendingPriority());
+    private readonly ActiveBehaviourCollectorOrdered<int, IExitUniverse> exitUniverses = new(GetPriority(), SortByAscendingPriority());
 
     private readonly List<IEnterUniverse> toCallEnterUniverses = new(32);
     private readonly List<IExitUniverse> toCallExitUniverses = new(32);
@@ -39,8 +40,9 @@ public class UniverseEntranceManager : Behaviour
     {
         for (int i = toCallExitUniverses.Count - 1; i >= 0; i--)
         {
-            toCallExitUniverses[i].ExitUniverse(Universe);
+            IExitUniverse exitUniverse = toCallExitUniverses[i];
             toCallExitUniverses.RemoveAt(i);
+            exitUniverse.ExitUniverse(Universe);
         }
     }
 
@@ -48,8 +50,9 @@ public class UniverseEntranceManager : Behaviour
     {
         for (int i = toCallEnterUniverses.Count - 1; i >= 0; i--)
         {
-            toCallEnterUniverses[i].EnterUniverse(Universe);
+            IEnterUniverse enterUniverse = toCallEnterUniverses[i];
             toCallEnterUniverses.RemoveAt(i);
+            enterUniverse.EnterUniverse(Universe);
         }
     }
 

Engine.Core/Systems/UpdateManager.cs

@@ -5,13 +5,14 @@ namespace Engine.Core;
 public class UpdateManager : Behaviour
 {
     // We use Ascending order because we are using reverse for loop to call them
-    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+    private static Comparer<int> SortByAscendingPriority() => Comparer<int>.Create((x, y) => x.CompareTo(y));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
-    private readonly ActiveBehaviourCollectorSorted<IFirstFrameUpdate> firstFrameUpdates = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, IFirstFrameUpdate> firstFrameUpdates = new(GetPriority(), SortByAscendingPriority());
     private readonly ActiveBehaviourCollector<ILastFrameUpdate> lastFrameUpdates = new();
-    private readonly ActiveBehaviourCollectorSorted<IPreUpdate> preUpdateEntities = new() { SortBy = SortByAscendingPriority() };
-    private readonly ActiveBehaviourCollectorSorted<IUpdate> updateEntities = new() { SortBy = SortByAscendingPriority() };
-    private readonly ActiveBehaviourCollectorSorted<IPostUpdate> postUpdateEntities = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, IPreUpdate> preUpdateEntities = new(GetPriority(), SortByAscendingPriority());
+    private readonly ActiveBehaviourCollectorOrdered<int, IUpdate> updateEntities = new(GetPriority(), SortByAscendingPriority());
+    private readonly ActiveBehaviourCollectorOrdered<int, IPostUpdate> postUpdateEntities = new(GetPriority(), SortByAscendingPriority());
 
     private readonly List<IFirstFrameUpdate> toCallFirstFrameUpdates = new(32);
 
@@ -23,6 +24,7 @@ public class UpdateManager : Behaviour
         updateEntities.Assign(universe);
         postUpdateEntities.Assign(universe);
 
+        universe.OnPreUpdate.AddListener(OnFirstUpdate, int.MaxValue);
         universe.OnPreUpdate.AddListener(OnPreUpdate);
         universe.OnUpdate.AddListener(OnUpdate);
         universe.OnPostUpdate.AddListener(OnPostUpdate);
@@ -36,19 +38,23 @@ public class UpdateManager : Behaviour
         updateEntities.Unassign();
         postUpdateEntities.Unassign();
 
+        universe.OnPreUpdate.RemoveListener(OnFirstUpdate);
         universe.OnPreUpdate.RemoveListener(OnPreUpdate);
         universe.OnUpdate.RemoveListener(OnUpdate);
         universe.OnPostUpdate.RemoveListener(OnPostUpdate);
     }
 
-    private void OnPreUpdate(IUniverse sender, IUniverse.UpdateArguments args)
+    private void OnFirstUpdate(IUniverse sender, IUniverse.UpdateArguments args)
     {
         for (int i = toCallFirstFrameUpdates.Count - 1; i >= 0; i--)
         {
             toCallFirstFrameUpdates[i].FirstActiveFrame();
             toCallFirstFrameUpdates.RemoveAt(i);
         }
+    }
 
+    private void OnPreUpdate(IUniverse sender, IUniverse.UpdateArguments args)
+    {
         for (int i = preUpdateEntities.Count - 1; i >= 0; i--)
             preUpdateEntities[i].PreUpdate();
     }

Engine.Core/Universe.cs

@@ -22,7 +22,7 @@ public class Universe : BaseEntity, IUniverse
     private readonly Event<IInitializable>.EventHandler delegateOnUniverseObjectFinalize = null!;
     private readonly Event<IUniverseObject, IUniverseObject.ExitedUniverseArguments>.EventHandler delegateOnUniverseObjectExitedUniverse = null!;
 
-    private readonly List<IUniverseObject> _universeObjects = new(Constants.UNIVERSE_OBJECTS_SIZE_INITIAL);
+    private readonly FastList<IUniverseObject> _universeObjects = new(Constants.UNIVERSE_OBJECTS_SIZE_INITIAL);
     private float _timeScale = 1f;
 
     public Universe()

Engine.Core/UniverseObject.cs

@@ -19,7 +19,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
     private IUniverse _universe = null!;
     private IBehaviourController _behaviourController = null!;
     private bool _isActive = false;
-    private readonly List<IUniverseObject> _children = [];
+    private readonly FastList<IUniverseObject> _children = [];
     private IUniverseObject? _parent = null;
 
     public IReadOnlyList<IUniverseObject> Children => _children;

Engine.Integration/Engine.Integration.MonoGame/Behaviours/KeyboardInputs.cs

@@ -10,11 +10,11 @@ namespace Engine.Integration.MonoGame;
 
 public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
 {
-    public Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments> OnAnyButtonPressed { get; } = new();
-    public Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments> OnAnyButtonReleased { get; } = new();
+    public IButtonInputs<Keys>.InputEvent OnAnyButtonPressed { get; } = new();
+    public IButtonInputs<Keys>.InputEvent OnAnyButtonReleased { get; } = new();
 
-    private readonly Dictionary<Keys, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>> OnPressed = new(256);
-    private readonly Dictionary<Keys, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>> OnReleased = new(256);
+    private readonly Dictionary<Keys, IButtonInputs<Keys>.InputEvent> OnPressed = new(256);
+    private readonly Dictionary<Keys, IButtonInputs<Keys>.InputEvent> OnReleased = new(256);
 
     private int cachePressedCurrentlyCount = 0;
     private readonly Keys[] cachePressedCurrently = new Keys[256];
@@ -22,9 +22,9 @@ public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
     private int cachePressedPreviouslyCount = 0;
     private readonly Keys[] cachePressedPreviously = new Keys[256];
 
-    public void RegisterOnPress(Keys key, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>.EventHandler callback)
+    public void RegisterOnPress(Keys key, IButtonInputs<Keys>.InputEvent.EventHandler callback)
     {
-        if (!OnPressed.TryGetValue(key, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? delegateCallback))
+        if (!OnPressed.TryGetValue(key, out IButtonInputs<Keys>.InputEvent? delegateCallback))
         {
             delegateCallback = new();
             OnPressed.Add(key, delegateCallback);
@@ -33,15 +33,15 @@ public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
         delegateCallback.AddListener(callback);
     }
 
-    public void UnregisterOnPress(Keys key, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>.EventHandler callback)
+    public void UnregisterOnPress(Keys key, IButtonInputs<Keys>.InputEvent.EventHandler callback)
     {
-        if (OnPressed.TryGetValue(key, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? delegateCallback))
+        if (OnPressed.TryGetValue(key, out IButtonInputs<Keys>.InputEvent? delegateCallback))
             delegateCallback.RemoveListener(callback);
     }
 
-    public void RegisterOnRelease(Keys key, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>.EventHandler callback)
+    public void RegisterOnRelease(Keys key, IButtonInputs<Keys>.InputEvent.EventHandler callback)
     {
-        if (!OnReleased.TryGetValue(key, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? delegateCallback))
+        if (!OnReleased.TryGetValue(key, out IButtonInputs<Keys>.InputEvent? delegateCallback))
         {
             delegateCallback = new();
             OnReleased.Add(key, delegateCallback);
@@ -50,9 +50,9 @@ public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
         delegateCallback.AddListener(callback);
     }
 
-    public void UnregisterOnRelease(Keys key, Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>.EventHandler callback)
+    public void UnregisterOnRelease(Keys key, IButtonInputs<Keys>.InputEvent.EventHandler callback)
     {
-        if (OnReleased.TryGetValue(key, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? delegateCallback))
+        if (OnReleased.TryGetValue(key, out IButtonInputs<Keys>.InputEvent? delegateCallback))
             delegateCallback.RemoveListener(callback);
     }
 
@@ -69,7 +69,7 @@ public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
             if (WasPressed(currentlyPressedKey))
                 continue;
 
-            if (OnPressed.TryGetValue(currentlyPressedKey, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? callback))
+            if (OnPressed.TryGetValue(currentlyPressedKey, out IButtonInputs<Keys>.InputEvent? callback))
                 callback?.Invoke(this, new(currentlyPressedKey));
 
             OnAnyButtonPressed?.Invoke(this, new(currentlyPressedKey));
@@ -82,7 +82,7 @@ public class KeyboardInputs : Behaviour, IButtonInputs<Keys>, IUpdate
             if (IsPressed(previouslyPressedKey))
                 continue;
 
-            if (OnReleased.TryGetValue(previouslyPressedKey, out Event<IButtonInputs<Keys>, IButtonInputs<Keys>.ButtonCallbackArguments>? callback))
+            if (OnReleased.TryGetValue(previouslyPressedKey, out IButtonInputs<Keys>.InputEvent? callback))
                 callback?.Invoke(this, new(previouslyPressedKey));
 
             OnAnyButtonReleased?.Invoke(this, new(previouslyPressedKey));

Engine.Integration/Engine.Integration.MonoGame/Behaviours/LoadContentManager.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+
 using Engine.Core;
 
 namespace Engine.Integration.MonoGame;
@@ -6,9 +7,10 @@ namespace Engine.Integration.MonoGame;
 public class LoadContentManager : Behaviour, IFirstFrameUpdate
 {
     // We use Ascending order because we are using reverse for loop to call them
-    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+    private static Comparer<int> SortByAscendingPriority() => Comparer<int>.Create((x, y) => x.CompareTo(y));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
-    private readonly ActiveBehaviourCollectorSorted<ILoadContent> loadContents = new() { SortBy = SortByAscendingPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, ILoadContent> loadContents = new(GetPriority(), SortByAscendingPriority());
     private readonly List<ILoadContent> toCallLoadContents = new(32);
 
     private MonoGameWindowContainer monoGameWindowContainer = null!;

Engine.Integration/Engine.Integration.MonoGame/Behaviours/SpriteBatcher.cs

@@ -6,12 +6,13 @@ namespace Engine.Integration.MonoGame;
 
 public class SpriteBatcher : BehaviourBase, IFirstFrameUpdate, IDraw
 {
-    private static Comparer<IBehaviour> SortByPriority() => Comparer<IBehaviour>.Create((x, y) => y.Priority.CompareTo(x.Priority));
+    private static Comparer<int> SortByPriority() => Comparer<int>.Create((x, y) => y.CompareTo(x));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
     private ISpriteBatch spriteBatch = null!;
     private MonoGameCamera2D camera2D = null!;
 
-    private readonly ActiveBehaviourCollectorSorted<IDrawableSprite> drawableSprites = new() { SortBy = SortByPriority() };
+    private readonly ActiveBehaviourCollectorOrdered<int, IDrawableSprite> drawableSprites = new(GetPriority(), SortByPriority());
 
     public void FirstActiveFrame()
     {

Engine.Integration/Engine.Integration.MonoGame/Behaviours/TriangleBatcher.cs

@@ -8,11 +8,13 @@ namespace Engine.Integration.MonoGame;
 
 public class TriangleBatcher : BehaviourBase, ITriangleBatch, IFirstFrameUpdate, IDraw
 {
-    private static Comparer<IBehaviour> SortByAscendingPriority() => Comparer<IBehaviour>.Create((x, y) => x.Priority.CompareTo(y.Priority));
+    private static Comparer<int> SortByAscendingPriority() => Comparer<int>.Create((x, y) => x.CompareTo(y));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
 
     private TriangleBatch triangleBatch = null!;
     private MonoGameCamera2D camera2D = null!;
-    private readonly ActiveBehaviourCollectorSorted<IDrawableTriangle> drawableShapes = new() { SortBy = SortByAscendingPriority() };
+
+    private readonly ActiveBehaviourCollectorOrdered<int, IDrawableTriangle> drawableShapes = new(GetPriority(), SortByAscendingPriority());
 
     public void FirstActiveFrame()
     {

Engine.Integration/Engine.Integration.MonoGame/TriangleBatch.cs

@@ -58,6 +58,9 @@ public class TriangleBatch : ITriangleBatch
 
     private void Flush()
     {
+        if (verticesIndex == 0)
+            return;
+
         graphicsDevice.RasterizerState = rasterizerState;
         basicEffect.Projection = _projection;
         basicEffect.View = _view;

Engine.Physics2D/PhysicsEngine2D.cs

@@ -17,11 +17,12 @@ public class PhysicsEngine2D : Behaviour, IPreUpdate, IPhysicsEngine2D
     protected readonly ICollisionResolver2D collisionResolver = null!;
     protected readonly IRaycastResolver2D raycastResolver = null!;
 
-    private static Comparer<IBehaviour> SortByPriority() => Comparer<IBehaviour>.Create((x, y) => y.Priority.CompareTo(x.Priority));
-    protected ActiveBehaviourCollectorSorted<IPrePhysicsUpdate> physicsPreUpdateCollector = new() { SortBy = SortByPriority() };
-    protected ActiveBehaviourCollectorSorted<IPhysicsUpdate> physicsUpdateCollector = new() { SortBy = SortByPriority() };
-    protected ActiveBehaviourCollectorSorted<IPhysicsIteration> physicsIterationCollector = new() { SortBy = SortByPriority() };
-    protected ActiveBehaviourCollectorSorted<IPostPhysicsUpdate> physicsPostUpdateCollector = new() { SortBy = SortByPriority() };
+    private static Comparer<int> SortByPriority() => Comparer<int>.Create((x, y) => y.CompareTo(x));
+    private static System.Func<IBehaviour, int> GetPriority() => (b) => b.Priority;
+    protected ActiveBehaviourCollectorOrdered<int, IPrePhysicsUpdate> physicsPreUpdateCollector = new(GetPriority(), SortByPriority());
+    protected ActiveBehaviourCollectorOrdered<int, IPhysicsUpdate> physicsUpdateCollector = new(GetPriority(), SortByPriority());
+    protected ActiveBehaviourCollectorOrdered<int, IPhysicsIteration> physicsIterationCollector = new(GetPriority(), SortByPriority());
+    protected ActiveBehaviourCollectorOrdered<int, IPostPhysicsUpdate> physicsPostUpdateCollector = new(GetPriority(), SortByPriority());
     protected BehaviourCollector<IRigidBody2D> rigidBodyCollector = new();
     protected BehaviourCollector<ICollider2D> colliderCollector = new();
 

Engine.Systems/Input/IButtonInputs.cs

@@ -4,15 +4,17 @@ namespace Engine.Systems.Input;
 
 public interface IButtonInputs<T> : IHasStateEnable
 {
-    Event<IButtonInputs<T>, ButtonCallbackArguments> OnAnyButtonPressed { get; }
-    Event<IButtonInputs<T>, ButtonCallbackArguments> OnAnyButtonReleased { get; }
+    InputEvent OnAnyButtonPressed { get; }
+    InputEvent OnAnyButtonReleased { get; }
 
-    void RegisterOnPress(T button, Event<IButtonInputs<T>, ButtonCallbackArguments>.EventHandler callback);
-    void UnregisterOnPress(T button, Event<IButtonInputs<T>, ButtonCallbackArguments>.EventHandler callback);
-    void RegisterOnRelease(T button, Event<IButtonInputs<T>, ButtonCallbackArguments>.EventHandler callback);
-    void UnregisterOnRelease(T button, Event<IButtonInputs<T>, ButtonCallbackArguments>.EventHandler callback);
+    void RegisterOnPress(T button, InputEvent.EventHandler callback);
+    void UnregisterOnPress(T button, InputEvent.EventHandler callback);
+    void RegisterOnRelease(T button, InputEvent.EventHandler callback);
+    void UnregisterOnRelease(T button, InputEvent.EventHandler callback);
 
     bool IsPressed(T button);
 
     readonly record struct ButtonCallbackArguments(T Button);
+
+    class InputEvent : Event<IButtonInputs<T>, ButtonCallbackArguments>;
 }

Engine.Systems/Network/Abstract/INetworkCommunicator.cs

@@ -16,22 +16,3 @@ public interface INetworkCommunicator
     INetworkCommunicator SubscribeToPackets<T>(Event<IConnection, T>.EventHandler callback);
     INetworkCommunicator UnsubscribeFromPackets<T>(Event<IConnection, T>.EventHandler callback);
 }
-
-public interface INetworkCommunicatorClient : INetworkCommunicator
-{
-    INetworkCommunicatorClient Connect(string address, int port, string? password = null);
-
-    INetworkCommunicatorClient SendToServer<T>(T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
-}
-
-public interface INetworkCommunicatorServer : INetworkCommunicator
-{
-    string Password { get; }
-    int MaxConnectionCount { get; }
-    int Port { get; }
-
-    INetworkCommunicatorServer Start(int port, int maxConnectionCount, string? password = null);
-
-    INetworkCommunicatorServer SendToClient<T>(IConnection connection, T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
-    INetworkCommunicatorServer SendToAll<T>(T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
-}

Engine.Systems/Network/Abstract/INetworkCommunicatorClient.cs

@@ -0,0 +1,8 @@
+namespace Engine.Systems.Network;
+
+public interface INetworkCommunicatorClient : INetworkCommunicator
+{
+    INetworkCommunicatorClient Connect(string address, int port, string? password = null);
+
+    INetworkCommunicatorClient SendToServer<T>(T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
+}

Engine.Systems/Network/Abstract/INetworkCommunicatorServer.cs

@@ -0,0 +1,13 @@
+namespace Engine.Systems.Network;
+
+public interface INetworkCommunicatorServer : INetworkCommunicator
+{
+    string Password { get; }
+    int MaxConnectionCount { get; }
+    int Port { get; }
+
+    INetworkCommunicatorServer Start(int port, int maxConnectionCount, string? password = null);
+
+    INetworkCommunicatorServer SendToClient<T>(IConnection connection, T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
+    INetworkCommunicatorServer SendToAll<T>(T packet, PacketDelivery packetDelivery = PacketDelivery.ReliableInOrder) where T : class, new();
+}

Engine.Systems/Network/TypeHasher.cs

@@ -0,0 +1,27 @@
+namespace Engine.Systems.Network;
+
+public static class TypeHasher<T>
+{
+    private static long _fnv1a = 0;
+    public static long FNV1a
+    {
+        get
+        {
+            if (_fnv1a == 0)
+                unchecked
+                {
+                    const long fnvPrime = 1099511628211;
+                    _fnv1a = 1469598103934665603;
+
+                    string typeName = typeof(T).FullName ?? typeof(T).Name;
+                    foreach (char c in typeName)
+                    {
+                        _fnv1a ^= c;
+                        _fnv1a *= fnvPrime;
+                    }
+                }
+
+            return _fnv1a;
+        }
+    }
+}

Engine.Systems/Tween/EngineExtensions/TweenAABBExtensions.cs

@@ -1,10 +1,24 @@
-using System;
 using Engine.Core;
 
 namespace Engine.Systems.Tween;
 
 public static class TweenAABBExtensions
 {
-    public static ITween TweenAABB(this AABB initialAABB, ITweenManager tweenManager, float duration, AABB targetAABB, Action<AABB> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(new AABB(initialAABB.LowerBoundary.Lerp(targetAABB.LowerBoundary, t), initialAABB.UpperBoundary.Lerp(targetAABB.UpperBoundary, t))));
+    private static readonly BoxedPool<AABB> boxedAABBPool = new(2);
+
+    public static ITween TweenAABB(this AABB initialAABB, ITweenManager tweenManager, float duration, AABB targetAABB, System.Action<AABB> setMethod)
+    {
+        Boxed<AABB> boxedInitial = boxedAABBPool.Get(initialAABB);
+        Boxed<AABB> boxedTarget = boxedAABBPool.Get(targetAABB);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(new AABB(boxedInitial.Value.LowerBoundary.Lerp(boxedTarget.Value.LowerBoundary, t), boxedInitial.Value.UpperBoundary.Lerp(boxedTarget.Value.UpperBoundary, t))));
+
+        tween.OnComplete(() =>
+        {
+            boxedAABBPool.Return(boxedInitial);
+            boxedAABBPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenCamera2DExtensions.cs

@@ -4,9 +4,21 @@ namespace Engine.Systems.Tween;
 
 public static class TweenCamera2DExtensions
 {
+    private static readonly BoxedPool<float> boxedFloatPool = new(2);
+
     public static ITween TweenZoom(this ICamera2D camera2D, ITweenManager tweenManager, float duration, float targetZoom)
     {
-        float initialZoom = camera2D.Zoom;
-        return tweenManager.StartTween(duration, t => camera2D.Zoom = initialZoom.Lerp(targetZoom, t));
+        Boxed<float> boxedInitial = boxedFloatPool.Get(camera2D.Zoom);
+        Boxed<float> boxedTarget = boxedFloatPool.Get(targetZoom);
+
+        ITween tween = tweenManager.StartTween(duration, t => camera2D.Zoom = boxedInitial.Value.Lerp(boxedTarget.Value, t));
+
+        tween.OnComplete(() =>
+        {
+            boxedFloatPool.Return(boxedInitial);
+            boxedFloatPool.Return(boxedTarget);
+        });
+
+        return tween;
     }
 }

Engine.Systems/Tween/EngineExtensions/TweenCircleExtensions.cs

@@ -4,13 +4,28 @@ namespace Engine.Systems.Tween;
 
 public static class TweenCircleExtensions
 {
+    private static readonly BoxedPool<Circle> boxedCirclePool = new(2);
+
     public static ITween TweenCircle(this Circle initialCircle, ITweenManager tweenManager, float duration, Circle targetCircle, System.Action<Circle> setMethod)
-        => tweenManager.StartTween(duration,
+    {
+        Boxed<Circle> boxedInitial = boxedCirclePool.Get(initialCircle);
+        Boxed<Circle> boxedTarget = boxedCirclePool.Get(targetCircle);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Circle(
-                    initialCircle.Center.Lerp(targetCircle.Center, t),
-                    initialCircle.Diameter.Lerp(targetCircle.Diameter, t)
+                    boxedInitial.Value.Center.Lerp(boxedTarget.Value.Center, t),
+                    boxedInitial.Value.Diameter.Lerp(boxedTarget.Value.Diameter, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedCirclePool.Return(boxedInitial);
+            boxedCirclePool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenColorExtensions.cs

@@ -4,6 +4,9 @@ namespace Engine.Systems.Tween;
 
 public static class TweenColorExtensions
 {
+    private static readonly BoxedPool<ColorHSV> boxedColorHSVPool = new(2);
+    private static readonly BoxedPool<ColorHSVA> boxedColorHSVAPool = new(2);
+
     public static ITween TweenColor(this ColorRGB initialColorRGB, ITweenManager tweenManager, float duration, ColorRGB targetColorRGB, System.Action<ColorRGB> setMethod)
         => TweenColor((ColorHSV)initialColorRGB, tweenManager, duration, (ColorHSV)targetColorRGB, color => setMethod?.Invoke(color));
 
@@ -11,8 +14,34 @@ public static class TweenColorExtensions
         => TweenColor((ColorHSVA)initialColorRGBA, tweenManager, duration, (ColorHSVA)targetColorRGBA, color => setMethod?.Invoke(color));
 
     public static ITween TweenColor(this ColorHSV initialColorHSV, ITweenManager tweenManager, float duration, ColorHSV targetColorHSV, System.Action<ColorHSV> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorHSV.Lerp(targetColorHSV, t)));
+    {
+        Boxed<ColorHSV> boxedInitial = boxedColorHSVPool.Get(initialColorHSV);
+        Boxed<ColorHSV> boxedTarget = boxedColorHSVPool.Get(targetColorHSV);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.Lerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedColorHSVPool.Return(boxedInitial);
+            boxedColorHSVPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 
     public static ITween TweenColor(this ColorHSVA initialColorHSVA, ITweenManager tweenManager, float duration, ColorHSVA targetColorHSVA, System.Action<ColorHSVA> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialColorHSVA.Lerp(targetColorHSVA, t)));
+    {
+        Boxed<ColorHSVA> boxedInitial = boxedColorHSVAPool.Get(initialColorHSVA);
+        Boxed<ColorHSVA> boxedTarget = boxedColorHSVAPool.Get(targetColorHSVA);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.Lerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+       {
+           boxedColorHSVAPool.Return(boxedInitial);
+           boxedColorHSVAPool.Return(boxedTarget);
+       });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenLine2DEquationExtensions.cs

@@ -4,13 +4,28 @@ namespace Engine.Systems.Tween;
 
 public static class TweenLine2DEquationExtensions
 {
+    private static readonly BoxedPool<Line2DEquation> boxedLine2DEquationPool = new(2);
+
     public static ITween TweenLine2DEquation(this Line2DEquation initialLine2DEquation, ITweenManager tweenManager, float duration, Line2DEquation targetLine2DEquation, System.Action<Line2DEquation> setMethod)
-        => tweenManager.StartTween(duration,
+    {
+        Boxed<Line2DEquation> boxedInitial = boxedLine2DEquationPool.Get(initialLine2DEquation);
+        Boxed<Line2DEquation> boxedTarget = boxedLine2DEquationPool.Get(targetLine2DEquation);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Line2DEquation(
-                    initialLine2DEquation.Slope.Lerp(targetLine2DEquation.Slope, t),
-                    initialLine2DEquation.OffsetY.Lerp(targetLine2DEquation.OffsetY, t)
+                    boxedInitial.Value.Slope.Lerp(boxedTarget.Value.Slope, t),
+                    boxedInitial.Value.OffsetY.Lerp(boxedTarget.Value.OffsetY, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedLine2DEquationPool.Return(boxedInitial);
+            boxedLine2DEquationPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenLine2DExtensions.cs

@@ -4,13 +4,28 @@ namespace Engine.Systems.Tween;
 
 public static class TweenLine2DExtensions
 {
+    private static readonly BoxedPool<Line2D> boxedLine2DPool = new(2);
+
     public static ITween TweenLine2D(this Line2D initialLine2D, ITweenManager tweenManager, float duration, Line2D targetLine2D, System.Action<Line2D> setMethod)
-        => tweenManager.StartTween(duration,
+    {
+        Boxed<Line2D> boxedInitial = boxedLine2DPool.Get(initialLine2D);
+        Boxed<Line2D> boxedTarget = boxedLine2DPool.Get(targetLine2D);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Line2D(
-                    initialLine2D.From.Lerp(targetLine2D.From, t),
-                    initialLine2D.To.Lerp(targetLine2D.To, t)
+                    boxedInitial.Value.From.Lerp(boxedTarget.Value.From, t),
+                    boxedInitial.Value.To.Lerp(boxedTarget.Value.To, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedLine2DPool.Return(boxedInitial);
+            boxedLine2DPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenPrimitiveExtensions.cs

@@ -0,0 +1,41 @@
+using Engine.Core;
+
+namespace Engine.Systems.Tween;
+
+public static class TweenPrimitiveExtensions
+{
+    private static readonly BoxedPool<float> boxedFloatPool = new(2);
+    private static readonly BoxedPool<int> boxedIntPool = new(2);
+
+    public static ITween TweenFloat(this float initialFloat, ITweenManager tweenManager, float duration, float targetFloat, System.Action<float> setMethod)
+    {
+        Boxed<float> boxedInitial = boxedFloatPool.Get(initialFloat);
+        Boxed<float> boxedTarget = boxedFloatPool.Get(targetFloat);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.Lerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedFloatPool.Return(boxedInitial);
+            boxedFloatPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
+
+    public static ITween TweenInt(this int initialInt, ITweenManager tweenManager, float duration, int targetInt, System.Action<float> setMethod)
+    {
+        Boxed<int> boxedInitial = boxedIntPool.Get(initialInt);
+        Boxed<int> boxedTarget = boxedIntPool.Get(targetInt);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value + (boxedTarget.Value - boxedInitial.Value) * t));
+
+        tween.OnComplete(() =>
+        {
+            boxedIntPool.Return(boxedInitial);
+            boxedIntPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
+}

Engine.Systems/Tween/EngineExtensions/TweenProjection1DExtensions.cs

@@ -1,17 +1,31 @@
-using System;
 using Engine.Core;
 
 namespace Engine.Systems.Tween;
 
 public static class TweenProjection1DExtensions
 {
-    public static ITween TweenProjection1D(this Projection1D initialProjection1D, ITweenManager tweenManager, float duration, Projection1D targetProjection1D, Action<Projection1D> setMethod)
-        => tweenManager.StartTween(duration,
+    private static readonly BoxedPool<Projection1D> boxedProjection1DPool = new(2);
+
+    public static ITween TweenProjection1D(this Projection1D initialProjection1D, ITweenManager tweenManager, float duration, Projection1D targetProjection1D, System.Action<Projection1D> setMethod)
+    {
+        Boxed<Projection1D> boxedInitial = boxedProjection1DPool.Get(initialProjection1D);
+        Boxed<Projection1D> boxedTarget = boxedProjection1DPool.Get(targetProjection1D);
+
+        ITween tween = tweenManager.StartTween(duration,
             t => setMethod?.Invoke(
                 new Projection1D(
-                    initialProjection1D.Min.Lerp(targetProjection1D.Min, t),
-                    initialProjection1D.Max.Lerp(targetProjection1D.Max, t)
+                    boxedInitial.Value.Min.Lerp(boxedTarget.Value.Min, t),
+                    boxedInitial.Value.Max.Lerp(boxedTarget.Value.Max, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedProjection1DPool.Return(boxedInitial);
+            boxedProjection1DPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenQuaternionExtensions.cs

@@ -1,10 +1,24 @@
-using System;
 using Engine.Core;
 
 namespace Engine.Systems.Tween;
 
 public static class TweenQuaternionExtensions
 {
-    public static ITween TweenQuaternion(this Quaternion initialQuaternion, ITweenManager tweenManager, float duration, Quaternion targetQuaternion, Action<Quaternion> setMethod)
-       => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialQuaternion.SLerp(targetQuaternion, t)));
+    private static readonly BoxedPool<Quaternion> boxedQuaternionPool = new(2);
+
+    public static ITween TweenQuaternion(this Quaternion initialQuaternion, ITweenManager tweenManager, float duration, Quaternion targetQuaternion, System.Action<Quaternion> setMethod)
+    {
+        Boxed<Quaternion> boxedInitial = boxedQuaternionPool.Get(initialQuaternion);
+        Boxed<Quaternion> boxedTarget = boxedQuaternionPool.Get(targetQuaternion);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.SLerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedQuaternionPool.Return(boxedInitial);
+            boxedQuaternionPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenTransform2DExtensions.cs

@@ -5,40 +5,23 @@ namespace Engine.Systems.Tween;
 public static class TweenTransform2DExtensions
 {
     public static ITween TweenPosition(this ITransform2D transform2D, ITweenManager tweenManager, float duration, Vector2D targetPosition)
-    {
-        Vector2D initialPosition = transform2D.Position;
-        return tweenManager.StartTween(duration, t => transform2D.Position = initialPosition.Lerp(targetPosition, t));
-    }
+        => transform2D.Position.TweenVector2D(tweenManager, duration, targetPosition, x => transform2D.Position = x);
 
     public static ITween TweenScale(this ITransform2D transform2D, ITweenManager tweenManager, float duration, Vector2D targetScale)
-    {
-        Vector2D initialScale = transform2D.Scale;
-        return tweenManager.StartTween(duration, t => transform2D.Scale = initialScale.Lerp(targetScale, t));
-    }
+        => transform2D.Scale.TweenVector2D(tweenManager, duration, targetScale, x => transform2D.Scale = x);
 
     public static ITween TweenRotation(this ITransform2D transform2D, ITweenManager tweenManager, float duration, float targetRotation)
-    {
-        float initialRotation = transform2D.Rotation;
-        return tweenManager.StartTween(duration, t => transform2D.Rotation = initialRotation.Lerp(targetRotation, t));
-    }
+        => transform2D.Rotation.TweenFloat(tweenManager, duration, targetRotation, x => transform2D.Rotation = x);
 
     public static ITween TweenLocalPosition(this ITransform2D transform2D, ITweenManager tweenManager, float duration, Vector2D targetLocalPosition)
-    {
-        Vector2D initialLocalPosition = transform2D.LocalPosition;
-        return tweenManager.StartTween(duration, t => transform2D.LocalPosition = initialLocalPosition.Lerp(targetLocalPosition, t));
-    }
+        => transform2D.LocalPosition.TweenVector2D(tweenManager, duration, targetLocalPosition, x => transform2D.LocalPosition = x);
 
     public static ITween TweenLocalScale(this ITransform2D transform2D, ITweenManager tweenManager, float duration, Vector2D targetLocalScale)
-    {
-        Vector2D initialLocalScale = transform2D.LocalScale;
-        return tweenManager.StartTween(duration, t => transform2D.LocalScale = initialLocalScale.Lerp(targetLocalScale, t));
-    }
+        => transform2D.LocalScale.TweenVector2D(tweenManager, duration, targetLocalScale, x => transform2D.LocalScale = x);
 
     public static ITween TweenLocalRotation(this ITransform2D transform2D, ITweenManager tweenManager, float duration, float targetLocalRotation)
-    {
-        float initialLocalRotation = transform2D.LocalRotation;
-        return tweenManager.StartTween(duration, t => transform2D.LocalRotation = initialLocalRotation.Lerp(targetLocalRotation, t));
-    }
+        => transform2D.LocalRotation.TweenFloat(tweenManager, duration, targetLocalRotation, x => transform2D.LocalRotation = x);
+
     public static ITween TweenPositionAdditive(this ITransform2D transform2D, ITweenManager tweenManager, float duration, Vector2D additivePosition)
     {
         Vector2D progressedPosition = Vector2D.Zero;

Engine.Systems/Tween/EngineExtensions/TweenTriangleExtensions.cs

@@ -1,18 +1,31 @@
-using System;
 using Engine.Core;
 
 namespace Engine.Systems.Tween;
 
 public static class TweenTriangleExtensions
 {
-    public static ITween TweenTriangle(this Triangle initialTriangle, ITweenManager tweenManager, float duration, Triangle targetTriangle, Action<Triangle> setMethod)
-       => tweenManager.StartTween(duration,
-            t => setMethod?.Invoke(
+    private static readonly BoxedPool<Triangle> boxedTrianglePool = new(2);
+
+    public static ITween TweenTriangle(this Triangle initialTriangle, ITweenManager tweenManager, float duration, Triangle targetTriangle, System.Action<Triangle> setMethod)
+    {
+        Boxed<Triangle> boxedInitial = boxedTrianglePool.Get(initialTriangle);
+        Boxed<Triangle> boxedTarget = boxedTrianglePool.Get(targetTriangle);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(
                 new Triangle(
-                    initialTriangle.A.Lerp(targetTriangle.A, t),
-                    initialTriangle.B.Lerp(targetTriangle.B, t),
-                    initialTriangle.C.Lerp(targetTriangle.C, t)
+                    boxedInitial.Value.A.Lerp(boxedTarget.Value.A, t),
+                    boxedInitial.Value.B.Lerp(boxedTarget.Value.B, t),
+                    boxedInitial.Value.C.Lerp(boxedTarget.Value.C, t)
                 )
             )
         );
+
+        tween.OnComplete(() =>
+        {
+            boxedTrianglePool.Return(boxedInitial);
+            boxedTrianglePool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenVector2DExtensions.cs

@@ -4,6 +4,21 @@ namespace Engine.Systems.Tween;
 
 public static class TweenVector2DExtensions
 {
+    private static readonly BoxedPool<Vector2D> boxedVector2DPool = new(2);
+
     public static ITween TweenVector2D(this Vector2D initialVector2D, ITweenManager tweenManager, float duration, Vector2D targetVector2D, System.Action<Vector2D> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialVector2D.Lerp(targetVector2D, t)));
+    {
+        Boxed<Vector2D> boxedInitial = boxedVector2DPool.Get(initialVector2D);
+        Boxed<Vector2D> boxedTarget = boxedVector2DPool.Get(targetVector2D);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.Lerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedVector2DPool.Return(boxedInitial);
+            boxedVector2DPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/EngineExtensions/TweenVector3DExtensions.cs

@@ -4,6 +4,21 @@ namespace Engine.Systems.Tween;
 
 public static class TweenVector3DExtensions
 {
+    private static readonly BoxedPool<Vector3D> boxedVector3DPool = new(2);
+
     public static ITween TweenVector3D(this Vector3D initialVector3D, ITweenManager tweenManager, float duration, Vector3D targetVector3D, System.Action<Vector3D> setMethod)
-        => tweenManager.StartTween(duration, t => setMethod?.Invoke(initialVector3D.Lerp(targetVector3D, t)));
+    {
+        Boxed<Vector3D> boxedInitial = boxedVector3DPool.Get(initialVector3D);
+        Boxed<Vector3D> boxedTarget = boxedVector3DPool.Get(targetVector3D);
+
+        ITween tween = tweenManager.StartTween(duration, t => setMethod?.Invoke(boxedInitial.Value.Lerp(boxedTarget.Value, t)));
+
+        tween.OnComplete(() =>
+        {
+            boxedVector3DPool.Return(boxedInitial);
+            boxedVector3DPool.Return(boxedTarget);
+        });
+
+        return tween;
+    }
 }

Engine.Systems/Tween/Helpers/Boxed.cs

@@ -0,0 +1,12 @@
+using Engine.Core;
+
+namespace Engine.Systems.Tween;
+
+public class Boxed<T> where T : struct
+{
+    public Event<Boxed<T>, BoxedValueChangedArguments> OnValueChanged { get; } = new();
+
+    public T Value { get; set; } = default;
+
+    public readonly record struct BoxedValueChangedArguments(T PreviousValue, T CurrentValue);
+}

Engine.Systems/Tween/Helpers/BoxedPool.cs

@@ -0,0 +1,14 @@
+using Engine.Core;
+
+namespace Engine.Systems.Tween;
+
+public class BoxedPool<T>(int initialCapacity = 1) : Pool<Boxed<T>>(() => new(), initialCapacity) where T : struct;
+public static class BoxedPoolExtensions
+{
+    public static Boxed<T> Get<T>(this BoxedPool<T> boxedPool, T value) where T : struct
+    {
+        Boxed<T> boxed = boxedPool.Get();
+        boxed.Value = value;
+        return boxed;
+    }
+}