main loop and timer efficiency

Server/Serialization.cs

@@ -789,7 +789,7 @@ namespace Server
 		}
 	}
 
-	public class BinaryFileReader : GenericReader
+	public sealed class BinaryFileReader : GenericReader
 	{
 		private BinaryReader m_File;
 
@@ -1144,7 +1144,7 @@ namespace Server
 		}
 	}
 
-	public class AsyncWriter : GenericWriter
+	public sealed class AsyncWriter : GenericWriter
 	{
 		private static int m_ThreadCount = 0;
 		public static int ThreadCount { get { return m_ThreadCount; } }