diff --git a/src/EcsWorld.cs b/src/EcsWorld.cs
index c4e725a..60beb5b 100644
--- a/src/EcsWorld.cs
+++ b/src/EcsWorld.cs
@@ -44,6 +44,11 @@ namespace DCFApixels.DragonECS
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _config; }
         }
+        public long Version
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get { return _version; }
+        }
         public bool IsDestroyed
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -56,7 +61,6 @@ namespace DCFApixels.DragonECS
         }
         public int Capacity
         {
-            //_denseEntities.Length;
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get { return _entitesCapacity; }
         }
@@ -203,6 +207,7 @@ namespace DCFApixels.DragonECS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public int NewEntity()
         {
+            unchecked { _version++; }
             int entityID = _entityDispenser.GetFree();
             _freeSpace--;
             _entitiesCount++;
@@ -367,6 +372,7 @@ namespace DCFApixels.DragonECS
             {
                 return;
             }
+            unchecked { _version++; }
             count = Math.Clamp(count, 0, _delEntBufferCount);
             _delEntBufferCount -= count;
             ReadOnlySpan<int> buffser = new ReadOnlySpan<int>(_delEntBuffer, _delEntBufferCount, count);
diff --git a/src/Executors/EcsWhereExecutor.cs b/src/Executors/EcsWhereExecutor.cs
index 03e4405..d0f42b7 100644
--- a/src/Executors/EcsWhereExecutor.cs
+++ b/src/Executors/EcsWhereExecutor.cs
@@ -7,7 +7,7 @@ namespace DCFApixels.DragonECS
         private TAspect _aspect;
         private int[] _filteredEntities;
 
-        private long _version;
+        private long _lastWorldVersion;
 
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
         private readonly EcsProfilerMarker _executeMarker = new EcsProfilerMarker("Where");
@@ -22,7 +22,7 @@ namespace DCFApixels.DragonECS
         public sealed override long Version
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _version;
+            get => _lastWorldVersion;
         }
         #endregion
 
@@ -46,8 +46,16 @@ namespace DCFApixels.DragonECS
             if (span.IsNull) throw new System.ArgumentNullException();//TODO составить текст исключения. 
             if (span.WorldID != WorldID) throw new System.ArgumentException();//TODO составить текст исключения. 
 #endif
-            unchecked { _version++; }
-            EcsSpan result = _aspect.GetIteratorFor(span).CopyToSpan(ref _filteredEntities);
+            EcsSpan result;
+            if (_lastWorldVersion != World.Version)
+            {
+                 result = _aspect.GetIteratorFor(span).CopyToSpan(ref _filteredEntities);
+                _lastWorldVersion = World.Version;
+            }
+            else
+            {
+                result = new EcsSpan(WorldID, _filteredEntities);
+            }
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
             _executeMarker.End();
 #endif
diff --git a/src/Executors/EcsWhereToGroupExecutor.cs b/src/Executors/EcsWhereToGroupExecutor.cs
index 107151b..74c4fa3 100644
--- a/src/Executors/EcsWhereToGroupExecutor.cs
+++ b/src/Executors/EcsWhereToGroupExecutor.cs
@@ -7,7 +7,7 @@ namespace DCFApixels.DragonECS
         private TAspect _aspect;
         private EcsGroup _filteredGroup;
 
-        private long _version;
+        private long _lastWorldVersion;
 
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
         private readonly EcsProfilerMarker _executeMarker = new EcsProfilerMarker("Where");
@@ -22,7 +22,7 @@ namespace DCFApixels.DragonECS
         public sealed override long Version
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get => _version;
+            get => _lastWorldVersion;
         }
         #endregion
 
@@ -49,8 +49,11 @@ namespace DCFApixels.DragonECS
             if (span.IsNull) throw new System.ArgumentNullException();//TODO составить текст исключения. 
             if (span.WorldID != WorldID) throw new System.ArgumentException();//TODO составить текст исключения. 
 #endif
-            unchecked { _version++; }
-            _aspect.GetIteratorFor(span).CopyTo(_filteredGroup);
+            if (_lastWorldVersion != World.Version)
+            {
+                _aspect.GetIteratorFor(span).CopyTo(_filteredGroup);
+                _lastWorldVersion = World.Version;
+            }
 #if (DEBUG && !DISABLE_DEBUG) || ENABLE_DRAGONECS_ASSERT_CHEKS
             _executeMarker.End();
 #endif