diff --git a/src/Builtin/Worlds.cs b/src/Builtin/Worlds.cs
index 8662512..d98a1db 100644
--- a/src/Builtin/Worlds.cs
+++ b/src/Builtin/Worlds.cs
@@ -1,5 +1,13 @@
 namespace DCFApixels.DragonECS
 {
-    public sealed class EcsDefaultWorld : EcsWorld { }
-    public sealed class EcsEventWorld : EcsWorld { }
+    public sealed class EcsDefaultWorld : EcsWorld
+    {
+        public EcsDefaultWorld() : base(null) { }
+        public EcsDefaultWorld(IEcsWorldConfig config) : base(config) { }
+    }
+    public sealed class EcsEventWorld : EcsWorld
+    {
+        public EcsEventWorld() : base(null) { }
+        public EcsEventWorld(IEcsWorldConfig config) : base(config) { }
+    }
 }
diff --git a/src/DataInterfaces.cs b/src/DataInterfaces.cs
index 4fed4d3..d200d3a 100644
--- a/src/DataInterfaces.cs
+++ b/src/DataInterfaces.cs
@@ -74,7 +74,7 @@ namespace DCFApixels.DragonECS
         static EcsComponentCopyHandler()
         {
             T def = default;
-            if(def is IEcsComponentCopy<T> intrf)
+            if (def is IEcsComponentCopy<T> intrf)
             {
                 instance = intrf;
             }
diff --git a/src/Debug/EcsDebug.cs b/src/Debug/EcsDebug.cs
index bb7bbef..279404f 100644
--- a/src/Debug/EcsDebug.cs
+++ b/src/Debug/EcsDebug.cs
@@ -41,6 +41,11 @@ namespace DCFApixels.DragonECS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void PrintWarning(object v) => Print(EcsConsts.DEBUG_WARNING_TAG, v);
         public static void PrintError(object v) => Print(EcsConsts.DEBUG_ERROR_TAG, v);
+        public static void PrintErrorAndBreak(object v)
+        {
+            Print(EcsConsts.DEBUG_ERROR_TAG, v);
+            Break();
+        }
         public static void PrintPass(object v) => Print(EcsConsts.DEBUG_PASS_TAG, v);
         public static void Print()
         {
diff --git a/src/EcsWorld.cs b/src/EcsWorld.cs
index 4bc4059..572c208 100644
--- a/src/EcsWorld.cs
+++ b/src/EcsWorld.cs
@@ -3,12 +3,14 @@ using DCFApixels.DragonECS.Utils;
 using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
+using static Leopotam.EcsLite.EcsWorld;
 
 namespace DCFApixels.DragonECS
 {
     public abstract partial class EcsWorld
     {
         public readonly short id;
+        private IEcsWorldConfig _config;
 
         private bool _isDestroyed;
 
@@ -36,6 +38,11 @@ namespace DCFApixels.DragonECS
         private readonly PoolsMediator _poolsMediator;
 
         #region Properties
+        public IEcsWorldConfig Config
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get { return _config; }
+        }
         public bool IsDestroyed
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -63,7 +70,7 @@ namespace DCFApixels.DragonECS
             get { return _isEnableAutoReleaseDelEntBuffer; }
         }
 
-        public EcsReadonlyGroup Entities 
+        public EcsReadonlyGroup Entities
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get
@@ -84,13 +91,15 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Constructors/Destroy
-        public EcsWorld() : this(true) { }
-        internal EcsWorld(bool isIndexable)
+        public EcsWorld(IEcsWorldConfig config) : this(config, true) { }
+        private EcsWorld(IEcsWorldConfig config, bool isIndexable)
         {
-            const int POOLS_CAPACITY = 512;
-            _poolsMediator = new PoolsMediator(this);
-
-            _entitesCapacity = 512;
+            if (config == null)
+            {
+                config = EmptyConfig.Instance;
+            }
+            config.Lock();
+            _config = config;
 
             if (isIndexable)
             {
@@ -102,13 +111,15 @@ namespace DCFApixels.DragonECS
                 Worlds[id] = this;
             }
 
+            _poolsMediator = new PoolsMediator(this);
             _entityDispenser = new IntDispenser(0);
-            _pools = new IEcsPoolImplementation[POOLS_CAPACITY];
-            _poolComponentCounts = new int[POOLS_CAPACITY];
-            //_sortedPoolIds = new int[POOLS_CAPACITY];
-            //_sortedPoolIdsMapping = new int[POOLS_CAPACITY];
+
+            int poolsCapacity = config.Get_PoolsCapacity();
+            _pools = new IEcsPoolImplementation[poolsCapacity];
+            _poolComponentCounts = new int[poolsCapacity];
             ArrayUtility.Fill(_pools, _nullPool);
 
+            _entitesCapacity = config.Get_EntitiesCapacity();
             _gens = new short[_entitesCapacity];
             _componentCounts = new short[_entitesCapacity];
 
@@ -116,9 +127,11 @@ namespace DCFApixels.DragonECS
             _delEntBufferCount = 0;
             _delEntBuffer = new int[_entitesCapacity];
             _entitiesComponentMasks = new int[_entitesCapacity][];
+
+            int maskLength = _pools.Length / 32 + 1;
             for (int i = 0; i < _entitesCapacity; i++)
             {
-                _entitiesComponentMasks[i] = new int[_pools.Length / 32 + 1];
+                _entitiesComponentMasks[i] = new int[maskLength];
             }
 
             _delEntBufferMinCount = Math.Max(_delEntBuffer.Length >> DEL_ENT_BUFFER_SIZE_OFFSET, DEL_ENT_BUFFER_MIN_SIZE);
@@ -264,7 +277,9 @@ namespace DCFApixels.DragonECS
             _entitiesCount++;
 
             if (_gens.Length <= entityID)
-                Upsize();
+            {
+                Upsize(_gens.Length << 1);
+            }
 
             _gens[entityID] &= GEN_BITS;
             _allEntites.Add(entityID);
@@ -432,24 +447,31 @@ namespace DCFApixels.DragonECS
 
         #region Upsize
         [MethodImpl(MethodImplOptions.NoInlining)]
-        private void Upsize()
+        public void Upsize(int minSize)
         {
-            Array.Resize(ref _gens, _gens.Length << 1);
-            Array.Resize(ref _componentCounts, _gens.Length);
-            Array.Resize(ref _delEntBuffer, _gens.Length);
-            Array.Resize(ref _entitiesComponentMasks, _gens.Length);
-            for (int i = _entitesCapacity; i < _gens.Length; i++)
+            if (minSize < Capacity)
+            {
+                return;
+            }
+
+            int newSize = 1 << (BitsUtility.GetHighBitNumber(minSize - 1) + 1);
+
+            Array.Resize(ref _gens, newSize);
+            Array.Resize(ref _componentCounts, newSize);
+            Array.Resize(ref _delEntBuffer, newSize);
+            Array.Resize(ref _entitiesComponentMasks, newSize);
+            for (int i = _entitesCapacity; i < newSize; i++)
                 _entitiesComponentMasks[i] = new int[_pools.Length / 32 + 1];
 
             _delEntBufferMinCount = Math.Max(_delEntBuffer.Length >> DEL_ENT_BUFFER_SIZE_OFFSET, DEL_ENT_BUFFER_MIN_SIZE);
             ArrayUtility.Fill(_gens, DEATH_GEN_BIT, _entitesCapacity);
-            _entitesCapacity = _gens.Length;
+            _entitesCapacity = newSize;
 
             for (int i = 0; i < _groups.Count; i++)
             {
                 if (_groups[i].TryGetTarget(out EcsGroup group))
                 {
-                    group.OnWorldResize(_gens.Length);
+                    group.OnWorldResize(newSize);
                 }
                 else
                 {
@@ -459,9 +481,11 @@ namespace DCFApixels.DragonECS
                 }
             }
             foreach (var item in _pools)
-                item.OnWorldResize(_gens.Length);
+            {
+                item.OnWorldResize(newSize);
+            }
 
-            _listeners.InvokeOnWorldResize(_gens.Length);
+            _listeners.InvokeOnWorldResize(newSize);
         }
         #endregion
 
@@ -538,6 +562,21 @@ namespace DCFApixels.DragonECS
             }
         }
         #endregion
+
+        #region EmptyConfig
+        private class EmptyConfig : IEcsWorldConfig
+        {
+            public static readonly EmptyConfig Instance = new EmptyConfig();
+            private EmptyConfig() { }
+            public bool IsLocked => true;
+            public T Get<T>(string valueName) { return default; }
+            public bool Has(string valueName) { return false; }
+            public void Lock() { }
+            public void Remove(string valueName) { }
+            public void Set<T>(string valueName, T value) { }
+            public bool TryGet<T>(string valueName, out T value) { value = default; return false; }
+        }
+        #endregion
     }
 
     #region Callbacks Interface
@@ -589,4 +628,4 @@ namespace DCFApixels.DragonECS
         public static entlong ToEntityLong(this int self, EcsWorld world) => world.GetEntityLong(self);
     }
     #endregion
-}
+}
\ No newline at end of file
diff --git a/src/EcsWorld.pools.cs b/src/EcsWorld.pools.cs
index a9c371d..c20881f 100644
--- a/src/EcsWorld.pools.cs
+++ b/src/EcsWorld.pools.cs
@@ -25,7 +25,7 @@ namespace DCFApixels.DragonECS
         public bool IsComponentTypeDeclared(Type type) => _componentIds.Contains(EcsTypeCode.Get(type));
         public bool IsComponentTypeDeclared(int componentTypeID)
         {
-            if(componentTypeID >= 0 && componentTypeID < _pools.Length)
+            if (componentTypeID >= 0 && componentTypeID < _pools.Length)
             {
                 return _pools[componentTypeID] != _nullPool;
             }
diff --git a/src/EcsWorld.static.cs b/src/EcsWorld.static.cs
index af03e07..8803f44 100644
--- a/src/EcsWorld.static.cs
+++ b/src/EcsWorld.static.cs
@@ -22,14 +22,14 @@ namespace DCFApixels.DragonECS
         private const int DEL_ENT_BUFFER_MIN_SIZE = 64;
 
         private static EcsWorld[] Worlds = new EcsWorld[4];
-        private static IdDispenser _worldIdDispenser = new IdDispenser(0);
+        private static IdDispenser _worldIdDispenser = new IdDispenser(4);
 
         private static List<DataReleaser> _dataReleaseres = new List<DataReleaser>();
         //public static int Copacity => Worlds.Length;
 
         static EcsWorld()
         {
-            Worlds[0] = new EcsNullWorld();
+            Worlds[0] = new NullWorld();
         }
         private static void ReleaseData(int worldID)
         {
@@ -121,9 +121,9 @@ namespace DCFApixels.DragonECS
                 }
             }
         }
-    }
-    internal sealed class EcsNullWorld : EcsWorld
-    {
-        internal EcsNullWorld() : base(false) { }
+        private sealed class NullWorld : EcsWorld
+        {
+            internal NullWorld() : base(EmptyConfig.Instance, false) { }
+        }
     }
 }
diff --git a/src/EcsWorldConfig.cs b/src/EcsWorldConfig.cs
new file mode 100644
index 0000000..98522b9
--- /dev/null
+++ b/src/EcsWorldConfig.cs
@@ -0,0 +1,124 @@
+using System;
+using System.Collections.Generic;
+
+namespace DCFApixels.DragonECS
+{
+    public interface IEcsWorldConfig
+    {
+        bool IsLocked { get; }
+        void Lock();
+        void Set<T>(string valueName, T value);
+        bool Has(string valueName);
+        T Get<T>(string valueName);
+        bool TryGet<T>(string valueName, out T value);
+        void Remove(string valueName);
+    }
+    public class EcsWorldConfig : IEcsWorldConfig
+    {
+        private Dictionary<string, object> _storage = new Dictionary<string, object>();
+        private bool _isLocked = false;
+        public bool IsLocked { get { return _isLocked; } }
+        public void Lock()
+        {
+            _isLocked = true;
+        }
+        public T Get<T>(string valueName)
+        {
+            return (T)_storage[valueName];
+        }
+        public bool Has(string valueName)
+        {
+            return _storage.ContainsKey(valueName);
+        }
+        public void Remove(string valueName)
+        {
+            _storage.Remove(valueName);
+        }
+        public void Set<T>(string valueName, T value)
+        {
+            if (_isLocked)
+            {
+                throw new InvalidOperationException();
+            }
+            _storage[valueName] = value;
+        }
+        public bool TryGet<T>(string valueName, out T value)
+        {
+            bool result = _storage.TryGetValue(valueName, out object rawValue);
+            value = rawValue == null ? default : (T)rawValue;
+            return result;
+        }
+    }
+    public static class EcsWorldConfigExtensions
+    {
+        public static T GetOrDefault<T>(this IEcsWorldConfig self, string valueName, T defaultValue)
+        {
+            if (self.TryGet(valueName, out T value))
+            {
+                return value;
+            }
+            return defaultValue;
+        }
+
+        private const string ENTITIES_CAPACITY = nameof(ENTITIES_CAPACITY);
+        private const int ENTITIES_CAPACITY_DEFAULT = 512;
+        public static TConfig Set_EntitiesCapacity<TConfig>(this TConfig self, int value)
+            where TConfig : IEcsWorldConfig
+        {
+            self.Set(ENTITIES_CAPACITY, value);
+            return self;
+        }
+        public static int Get_EntitiesCapacity(this IEcsWorldConfig self)
+        {
+            return self.GetOrDefault(ENTITIES_CAPACITY, ENTITIES_CAPACITY_DEFAULT);
+        }
+
+        //private const string RECYCLED_ENTITIES_CAPACITY = nameof(RECYCLED_ENTITIES_CAPACITY);
+        //public static void Set_RecycledEntitiesCapacity(this IEcsWorldConfig self, int value)
+        //{
+        //    self.Set(RECYCLED_ENTITIES_CAPACITY, value);
+        //}
+        //public static int Get_RecycledEntitiesCapacity(this IEcsWorldConfig self)
+        //{
+        //    return self.GetOrDefault(RECYCLED_ENTITIES_CAPACITY, self.Get_EntitiesCapacity() / 2);
+        //}
+
+        private const string POOLS_CAPACITY = nameof(POOLS_CAPACITY);
+        private const int POOLS_CAPACITY_DEFAULT = 512;
+        public static TConfig Set_PoolsCapacity<TConfig>(this TConfig self, int value)
+            where TConfig : IEcsWorldConfig
+        {
+            self.Set(POOLS_CAPACITY, value);
+            return self;
+        }
+        public static int Get_PoolsCapacity(this IEcsWorldConfig self)
+        {
+            return self.GetOrDefault(POOLS_CAPACITY, POOLS_CAPACITY_DEFAULT);
+        }
+
+        private const string COMPONENT_POOL_CAPACITY = nameof(COMPONENT_POOL_CAPACITY);
+        private const int COMPONENT_POOL_CAPACITY_DEFAULT = 512;
+        public static TConfig Set_PoolComponentsCapacity<TConfig>(this TConfig self, int value)
+            where TConfig : IEcsWorldConfig
+        {
+            self.Set(COMPONENT_POOL_CAPACITY, value);
+            return self;
+        }
+        public static int Get_PoolComponentsCapacity(this IEcsWorldConfig self)
+        {
+            return self.GetOrDefault(COMPONENT_POOL_CAPACITY, COMPONENT_POOL_CAPACITY_DEFAULT);
+        }
+
+        private const string POOL_RECYCLED_COMPONENTS_CAPACITY = nameof(POOL_RECYCLED_COMPONENTS_CAPACITY);
+        public static TConfig Set_PoolRecycledComponentsCapacity<TConfig>(this TConfig self, int value)
+            where TConfig : IEcsWorldConfig
+        {
+            self.Set(POOL_RECYCLED_COMPONENTS_CAPACITY, value);
+            return self;
+        }
+        public static int Get_PoolRecycledComponentsCapacity(this IEcsWorldConfig self)
+        {
+            return self.GetOrDefault(POOL_RECYCLED_COMPONENTS_CAPACITY, self.Get_PoolComponentsCapacity() / 2);
+        }
+    }
+}
diff --git a/src/Pools/EcsPool.cs b/src/Pools/EcsPool.cs
index 2f0755a..07a5a26 100644
--- a/src/Pools/EcsPool.cs
+++ b/src/Pools/EcsPool.cs
@@ -143,12 +143,10 @@ namespace DCFApixels.DragonECS
             _componentTypeID = componentTypeID;
             _maskBit = EcsMaskChunck.FromID(componentTypeID);
 
-            const int capacity = 512;
-
             _mapping = new int[world.Capacity];
-            _recycledItems = new int[128];
+            _recycledItems = new int[world.Config.Get_PoolRecycledComponentsCapacity()];
             _recycledItemsCount = 0;
-            _items = new T[capacity];
+            _items = new T[world.Config.Get_PoolComponentsCapacity()];
             _itemsCount = 0;
         }
         void IEcsPoolImplementation.OnWorldResize(int newSize)
diff --git a/src/Utils/Exceptions.cs b/src/Utils/Exceptions.cs
index b883552..243646f 100644
--- a/src/Utils/Exceptions.cs
+++ b/src/Utils/Exceptions.cs
@@ -81,6 +81,11 @@ namespace DCFApixels.DragonECS.Internal
             else
                 throw new EcsFrameworkException($"The {entity} is not alive.");
         }
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        internal static void UndefinedException()
+        {
+            throw new Exception();
+        }
     }
 }
 
diff --git a/src/Utils/IntDispenser.cs b/src/Utils/IntDispenser.cs
index 96fb120..df975e4 100644
--- a/src/Utils/IntDispenser.cs
+++ b/src/Utils/IntDispenser.cs
@@ -14,12 +14,7 @@ namespace DCFApixels.DragonECS.Utils
         #endregion
 
         #region Constructor
-        public IntDispenser()
-        {
-            _freeInts = new ConcurrentQueue<int>();
-            _increment = 0;
-        }
-        public IntDispenser(int startIncrement)
+        public IntDispenser(int startIncrement = 0)
         {
             _freeInts = new ConcurrentQueue<int>();
             _increment = startIncrement;