diff --git a/src/Debug/Attributes/DebugColorAttribute.cs b/src/Debug/Attributes/DebugColorAttribute.cs
index 253f64f..378a02b 100644
--- a/src/Debug/Attributes/DebugColorAttribute.cs
+++ b/src/Debug/Attributes/DebugColorAttribute.cs
@@ -10,45 +10,31 @@ namespace DCFApixels.DragonECS
         public byte r => color.r;
         public byte g => color.g;
         public byte b => color.b;
-
+        /// <summary>normalized R channel </summary>
         public float rn => color.r / 255f;
+        /// <summary>normalized G channel </summary>
         public float gn => color.g / 255f;
+        /// <summary>normalized B channel </summary>
         public float bn => color.b / 255f;
-
-        public DebugColorAttribute(byte r, byte g, byte b)
-        {
-            color = new ColorRecord(r, g, b);
-        }
-        public DebugColorAttribute(DebugColor color)
-        {
-            this.color = new ColorRecord((int)color);
-        }
+        public DebugColorAttribute(byte r, byte g, byte b) => color = new ColorRecord(r, g, b);
+        public DebugColorAttribute(DebugColor color) => this.color = new ColorRecord((int)color);
 
         [StructLayout(LayoutKind.Explicit, Pack = 1, Size = 4)]
         private readonly struct ColorRecord // Union
         {
-            [FieldOffset(0)]
-            public readonly int full;
-            [FieldOffset(3)]
-            public readonly byte r;
-            [FieldOffset(2)]
-            public readonly byte g;
-            [FieldOffset(1)]
-            public readonly byte b;
-
+            [FieldOffset(0)] public readonly int full;
+            [FieldOffset(3)] public readonly byte r;
+            [FieldOffset(2)] public readonly byte g;
+            [FieldOffset(1)] public readonly byte b;
             public ColorRecord(byte r, byte g, byte b) : this()
             {
                 this.r = r;
                 this.g = g;
                 this.b = b;
             }
-            public ColorRecord(int full) : this()
-            {
-                this.full = full;
-            }
+            public ColorRecord(int full) : this() => this.full = full;
         }
     }
-
     public enum DebugColor
     {
         /// <summary> Red. RGB is (255, 0, 0)</summary>
diff --git a/src/Debug/Attributes/DebugDescriptionAttribute.cs b/src/Debug/Attributes/DebugDescriptionAttribute.cs
index 88a50c5..1a7aacd 100644
--- a/src/Debug/Attributes/DebugDescriptionAttribute.cs
+++ b/src/Debug/Attributes/DebugDescriptionAttribute.cs
@@ -6,9 +6,6 @@ namespace DCFApixels.DragonECS
     public sealed class DebugDescriptionAttribute : Attribute
     {
         public readonly string description;
-        public DebugDescriptionAttribute(string description) 
-        {
-            this.description = description;
-        }
+        public DebugDescriptionAttribute(string description) => this.description = description;
     }
 }
diff --git a/src/Debug/Attributes/DebugNameAttribute.cs b/src/Debug/Attributes/DebugNameAttribute.cs
index 30c4d57..01f6fda 100644
--- a/src/Debug/Attributes/DebugNameAttribute.cs
+++ b/src/Debug/Attributes/DebugNameAttribute.cs
@@ -6,9 +6,6 @@ namespace DCFApixels.DragonECS
     public sealed class DebugNameAttribute : Attribute
     {
         public readonly string name;
-        public DebugNameAttribute(string name)
-        {
-            this.name = name;
-        }
+        public DebugNameAttribute(string name) => this.name = name;
     }
 }
diff --git a/src/EcsGroup.cs b/src/EcsGroup.cs
index 2bb9460..2f0ee31 100644
--- a/src/EcsGroup.cs
+++ b/src/EcsGroup.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 #if (DEBUG && !DISABLE_DEBUG) || !DISABLE_DRAGONECS_ASSERT_CHEKS
@@ -8,6 +9,7 @@ using static DCFApixels.DragonECS.EcsGroup.ThrowHalper;
 namespace DCFApixels.DragonECS
 {
     [StructLayout(LayoutKind.Sequential, Pack = 0, Size = 8)]
+    [DebuggerTypeProxy(typeof(DebuggerProxy))]
     public readonly ref struct EcsReadonlyGroup
     {
         private readonly EcsGroup _source;
@@ -65,12 +67,7 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Object
-        public override string ToString()
-        {
-            if (_source != null)
-                return _source.ToString();
-            return "NULL";
-        }
+        public override string ToString() => _source != null ? _source.ToString() : "NULL";
         public override int GetHashCode() => _source.GetHashCode();
         public override bool Equals(object obj) => obj is EcsGroup group && group == this;
         public bool Equals(EcsReadonlyGroup other) => _source == other._source;
@@ -88,15 +85,23 @@ namespace DCFApixels.DragonECS
         public static bool operator !=(EcsReadonlyGroup a, EcsReadonlyGroup b) => !a.Equals(b);
         public static bool operator !=(EcsReadonlyGroup a, EcsGroup b) => !a.Equals(b);
         #endregion
+
+        #region DebuggerProxy
+        internal class DebuggerProxy : EcsGroup.DebuggerProxy
+        {
+            public DebuggerProxy(EcsReadonlyGroup group) : base(group._source) { }
+        }
+        #endregion
     }
 
+    [DebuggerTypeProxy(typeof(DebuggerProxy))]
     public unsafe class EcsGroup : IDisposable, IEquatable<EcsGroup>
     {
         private EcsWorld _source;
         private int[] _dense;
         private int[] _sparse;
         private int _count;
-        private bool _isReleased = true;
+        internal bool _isReleased = true;
 
         #region Properties
         public EcsWorld World => _source;
@@ -391,10 +396,7 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region Object
-        public override string ToString()
-        {
-            return string.Join(", ", _dense.AsSpan(1, _count).ToArray());
-        }
+        public override string ToString() => string.Join(", ", _dense.AsSpan(1, _count).ToArray());
         public override bool Equals(object obj) => obj is EcsGroup group && Equals(group);
         public bool Equals(EcsReadonlyGroup other) => Equals(other.GetGroupInternal());
         public bool Equals(EcsGroup other)
@@ -448,13 +450,9 @@ namespace DCFApixels.DragonECS
         #endregion
 
         #region IDisposable/Release
-        public void Dispose()
-        {
-            Release();
-        }
+        public void Dispose() => Release();
         public void Release()
         {
-            _isReleased = true;
             _source.ReleaseGroup(this);
         }
         #endregion
@@ -472,21 +470,30 @@ namespace DCFApixels.DragonECS
         }
 #endif
         #endregion
-    }
 
-    #region Extensions
-    public static class EcsGroupExtensions
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Normalize<T>(this EcsGroup self, ref T[] array)
+        #region DebuggerProxy
+        internal class DebuggerProxy
         {
-            if (array.Length < self.CapacityDense) Array.Resize(ref array, self.CapacityDense);
-        }
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static void Normalize<T>(this EcsReadonlyGroup self, ref T[] array)
-        {
-            if (array.Length < self.CapacityDense) Array.Resize(ref array, self.CapacityDense);
+            private EcsGroup _group;
+            public EcsWorld World => _group.World;
+            public bool IsReleased => _group.IsReleased;
+            public entlong[] Entities
+            {
+                get
+                {
+                    entlong[] result = new entlong[_group.Count];
+                    int i = 0;
+                    foreach (var e in _group)
+                        result[i++] = _group.World.GetEntityLong(e);
+                    return result;
+                }
+            }
+            public int Count => _group.Count;
+            public int CapacityDense => _group.CapacityDense;
+            public int CapacitySparce => _group.CapacitySparce;
+
+            public DebuggerProxy(EcsGroup group) => _group = group;
         }
+        #endregion
     }
-    #endregion
-}
+}
\ No newline at end of file
diff --git a/src/EcsWorld.cs b/src/EcsWorld.cs
index 42d4aab..1d88b3c 100644
--- a/src/EcsWorld.cs
+++ b/src/EcsWorld.cs
@@ -322,15 +322,16 @@ namespace DCFApixels.DragonECS
         }
         #endregion
 
-        #region Groups
+        #region Groups Pool
         internal void RegisterGroup(EcsGroup group)
         {
             _groups.Add(new WeakReference<EcsGroup>(group));
         }
         internal EcsGroup GetGroupFromPool()
         {
-            if (_groupsPool.Count <= 0) return new EcsGroup(this);
-            return _groupsPool.Pop();
+            EcsGroup result = _groupsPool.Count <= 0 ? new EcsGroup(this) : _groupsPool.Pop();
+            result._isReleased = false;
+            return result;
         }
         internal void ReleaseGroup(EcsGroup group)
         {
@@ -338,6 +339,7 @@ namespace DCFApixels.DragonECS
             if (group.World != this)
                 throw new ArgumentException("groupFilter.WorldIndex != this");
 #endif
+            group._isReleased = true;
             group.Clear();
             _groupsPool.Push(group);
         }