add framelimiter as per Joseph_Vissarion's patch

OpenRA.Game/Game.cs

@@ -326,8 +326,20 @@ namespace OpenRA
 		internal static void Run()
 		{
 			while (!quit)
+			{
+				var idealFrameTime = 1.0 / Settings.Graphics.MaxFramerate;
+				var sw = new Stopwatch();
+
 				Tick( orderManager, viewport );
 
+				if (Settings.Graphics.CapFramerate)
+				{
+					var waitTime = idealFrameTime - sw.ElapsedTime();
+					if (waitTime > 0)
+						System.Threading.Thread.Sleep( TimeSpan.FromSeconds(waitTime) );
+				}
+			}
+
 			OnQuit();
 		}
 

OpenRA.Game/GameRules/Settings.cs

@@ -60,6 +60,8 @@ namespace OpenRA.GameRules
 		public int2 FullscreenSize = new int2(0,0);
 		public int2 WindowedSize = new int2(1024, 768);
 		public bool PixelDouble = false;
+		public bool CapFramerate = false;
+		public int MaxFramerate = 60;
 
 		public int BatchSize = 8192;
 		public int NumTempBuffers = 8;