Only paint the screen when needed, which is once per frame, or when the OSD is invoked. Also when lua draws things. I think I invoked it in all the logical places but probably missed some things. The lua logic needs to be refactored anyway to have a paint method, and an onpaint event

BizHawk.MultiClient/DisplayManager/DisplayManager.cs

@@ -391,16 +391,20 @@ namespace BizHawk.MultiClient
 
 		public void AddMessage(string message)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			messages.Add(new UIMessage { Message = message, ExpireAt = DateTime.Now + TimeSpan.FromSeconds(2) });
 		}
 
 		public void AddGUIText(string message, int x, int y, bool alert, Color BackGround, Color ForeColor, int anchor)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			GUITextList.Add(new UIDisplay { Message = message, X = x, Y = y, BackGround = BackGround, ForeColor = ForeColor, Alert = alert, Anchor = anchor });
 		}
 
 		public void ClearGUIText()
 		{
+			Global.DisplayManager.NeedsToPaint = true;
+
 			GUITextList.Clear();
 		}
 
@@ -476,6 +480,8 @@ namespace BizHawk.MultiClient
 
 		public string MakeInputDisplay()
 		{
+			var blah = DateTime.Now.Ticks;
+			return blah.ToString();
 			StringBuilder s;
 			if (!Global.MovieSession.Movie.IsActive || Global.MovieSession.Movie.IsFinished)
 			{
@@ -645,6 +651,7 @@ namespace BizHawk.MultiClient
 
 		readonly SwappableDisplaySurfaceSet sourceSurfaceSet = new SwappableDisplaySurfaceSet();
 
+		public bool NeedsToPaint { get; set; }
 
 		DisplaySurface luaEmuSurface = null;
 		public void PreFrameUpdateLuaSource()
@@ -712,6 +719,8 @@ namespace BizHawk.MultiClient
 			if (filteredSurface != null)
 				filteredSurface.Dispose();
 			filteredSurface = null;
+
+			NeedsToPaint = false;
 		}
 
 		public bool Disposed { get; private set; }

BizHawk.MultiClient/LuaImplementation.cs

@@ -886,11 +886,13 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawString(object X, object Y, object message, object color = null, object fontsize = null, object fontfamily = null, object fontstyle = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			gui_drawText(X, Y, message, color, fontsize, fontfamily, fontstyle);
 		}
 
 		public void gui_drawText(object X, object Y, object message, object color = null, object fontsize = null, object fontfamily = null, object fontstyle = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -943,6 +945,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawPixel(object X, object Y, object color = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				float x = LuaInt(X) + 0.1F;
@@ -959,6 +962,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawLine(object x1, object y1, object x2, object y2, object color = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -974,6 +978,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawEllipse(object X, object Y, object width, object height, object line, object background = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -995,6 +1000,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawPolygon(LuaTable points, object line, object background = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			//this is a test
 			using (var g = GetGraphics())
 			{
@@ -1038,6 +1044,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawBezier(LuaTable points, object color)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -1064,6 +1071,7 @@ namespace BizHawk.MultiClient
 		public void gui_drawPie(object X, object Y, object width, object height, object startangle, object sweepangle,
 								object line, object background = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -1085,6 +1093,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawIcon(object Path, object x, object y, object width = null, object height = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -1110,6 +1119,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_drawImage(object Path, object x, object y, object width = null, object height = null)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			using (var g = GetGraphics())
 			{
 				try
@@ -1132,6 +1142,7 @@ namespace BizHawk.MultiClient
 
 		public void gui_clearGraphics()
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			luaSurface.Clear();
 		}
 
@@ -1146,6 +1157,7 @@ namespace BizHawk.MultiClient
 
 		public void emu_yield()
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			currThread.Yield(0);
 		}
 

BizHawk.MultiClient/MainForm.MenuItems.cs

@@ -482,21 +482,25 @@ namespace BizHawk.MultiClient
 
 		private void displayFPSToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			ToggleFPS();
 		}
 
 		private void displayFrameCounterToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			ToggleFrameCounter();
 		}
 
 		private void displayInputToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			ToggleInputDisplay();
 		}
 
 		private void displayLagCounterToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			ToggleLagCounter();
 		}
 
@@ -705,6 +709,7 @@ namespace BizHawk.MultiClient
 
 		private void displayRerecordCountToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			Global.Config.DisplayRerecordCount ^= true;
 		}
 
@@ -1127,6 +1132,7 @@ namespace BizHawk.MultiClient
 
 		private void displaySubtitlesToolStripMenuItem_Click(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			Global.Config.DisplaySubtitles ^= true;
 		}
 
@@ -1325,6 +1331,7 @@ namespace BizHawk.MultiClient
 
 		private void menuStrip1_MenuDeactivate(object sender, EventArgs e)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			if (!wasPaused)
 			{
 				UnpauseEmulator();

BizHawk.MultiClient/MainForm.cs

@@ -622,7 +622,7 @@ namespace BizHawk.MultiClient
 				//if(!IsNullEmulator())
 				StepRunLoop_Throttle();
 
-				Render();
+				if (Global.DisplayManager.NeedsToPaint) { Render(); }
 
 				CheckMessages();
 				if (exit)
@@ -2201,6 +2201,7 @@ namespace BizHawk.MultiClient
 				//=======================================
 				MemoryPulse.Pulse();
 				Global.Emulator.FrameAdvance(!throttle.skipnextframe || CurrAviWriter != null, !coreskipaudio);
+				Global.DisplayManager.NeedsToPaint = true;
 				MemoryPulse.Pulse();
 				//=======================================
 
@@ -2483,6 +2484,7 @@ namespace BizHawk.MultiClient
 
 		public void LoadStateFile(string path, string name, bool fromLua = false)
 		{
+			Global.DisplayManager.NeedsToPaint = true;
 			// try to detect binary first
 			BinaryStateLoader bw = BinaryStateLoader.LoadAndDetect(path);
 			if (bw != null)
@@ -4141,5 +4143,20 @@ namespace BizHawk.MultiClient
 		{
 			new FirmwaresConfig().Show();
 		}
+
+		private void menuStrip1_Leave(object sender, EventArgs e)
+		{
+			Global.DisplayManager.NeedsToPaint = true;
+		}
+
+		private void MainForm_Enter(object sender, EventArgs e)
+		{
+			Global.DisplayManager.NeedsToPaint = true;
+		}
+
+		private void MainForm_Paint(object sender, PaintEventArgs e)
+		{
+			Global.DisplayManager.NeedsToPaint = true;
+		}
 	}
 }