diff --git a/src/Debug/MetaAttributes/MetaGroupAttribute.cs b/src/Debug/MetaAttributes/MetaGroupAttribute.cs
index e8dd599..f494656 100644
--- a/src/Debug/MetaAttributes/MetaGroupAttribute.cs
+++ b/src/Debug/MetaAttributes/MetaGroupAttribute.cs
@@ -17,7 +17,7 @@ namespace DCFApixels.DragonECS
         }
         public MetaGroupAttribute(params string[] path)
         {
-            Data = new MetaGroupRef(string.Join('/', path));
+            Data = new MetaGroupRef(string.Join("/", path));
         }
     }
     public class MetaGroupRef
@@ -27,13 +27,14 @@ namespace DCFApixels.DragonECS
         public readonly string Name;
         private string[] path = null;
         private static string pattern = @"Module(?=/)";
+        private static char[] separatpor = new char[] { '/' };
         public IReadOnlyCollection<string> Splited
         {
             get
             {
                 if (path == null)
                 {
-                    path = Name.Split('/', StringSplitOptions.RemoveEmptyEntries);
+                    path = Name.Split(separatpor, StringSplitOptions.RemoveEmptyEntries);
                 }
                 return path;
             }
diff --git a/src/Utils/UncheckedCoreUtility.cs b/src/Utils/UncheckedCoreUtility.cs
index 5538d81..a85f4fc 100644
--- a/src/Utils/UncheckedCoreUtility.cs
+++ b/src/Utils/UncheckedCoreUtility.cs
@@ -34,7 +34,7 @@ namespace DCFApixels.DragonECS.UncheckedCore
         }
         public static bool CheckSpanValideDebug(EcsSpan span)
         {
-            HashSet<int> set = new HashSet<int>(span.Count);
+            HashSet<int> set = new HashSet<int>();
             foreach (var e in span)
             {
                 if (set.Add(e) == false)