perf counter for synchash

OpenRa.Game/World.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using OpenRa.Game.Effects;
+using OpenRa.Game.Support;
 
 namespace OpenRa.Game
 {
@@ -54,12 +55,15 @@ namespace OpenRa.Game
 		}
 
 		public int SyncHash()
+		{
+			using (new PerfSample("synchash"))
 			{
 				int ret = 0;
-			foreach( var a in Actors )
+				foreach (var a in Actors)
-				ret += (int)a.ActorID * Sync.CalculateSyncHash( a );
+					ret += (int)a.ActorID * Sync.CalculateSyncHash(a);
 
 				return ret;
 			}
 		}
+	}
 }