add PerfGraph option (default true for now)

OpenRa.Game/Chrome.cs

@@ -176,6 +176,7 @@ namespace OpenRa.Game
 				Game.LocalPlayer.IsReady ? "Yes" : "No"
 				), new int2(140, 15), Color.White);
 
+			if (Game.Settings.PerfGraph)
 				PerfHistory.Render(renderer, Game.worldRenderer.lineRenderer);
 
 			DrawMinimap();

OpenRa.Game/GameRules/UserSettings.cs

@@ -7,6 +7,7 @@ namespace OpenRa.Game.GameRules
 		public readonly bool UnitDebug = false;
 		public readonly bool BuildingDebug = false;
 		public readonly bool PathDebug = false;
+		public readonly bool PerfGraph = true;
 		
 		// Window settings
 		public readonly int Width = 0;

settings.ini.old

@@ -0,0 +1,2 @@
+[Settings]
+PerfGraph = true