diff --git a/screendump/FrameUpdater.m b/screendump/FrameUpdater.m
index c925f21..8498585 100644
--- a/screendump/FrameUpdater.m
+++ b/screendump/FrameUpdater.m
@@ -67,8 +67,7 @@
 	[self stopFrameLoop];
 	_updatingFrames = YES;
 	dispatch_async(dispatch_get_main_queue(), ^(void){
-		// TODO: can we make VSync happen here?
-		_updateFrameTimer = [NSTimer scheduledTimerWithTimeInterval:1/500 target:self selector:@selector(_updateFrame) userInfo:nil repeats:YES];
+		_updateFrameTimer = [NSTimer scheduledTimerWithTimeInterval:1/400 target:self selector:@selector(_updateFrame) userInfo:nil repeats:YES];
 	});
 }
 
diff --git a/screendump/ScreenDumpVNC.m b/screendump/ScreenDumpVNC.m
index bce997f..bd2c50e 100644
--- a/screendump/ScreenDumpVNC.m
+++ b/screendump/ScreenDumpVNC.m
@@ -114,7 +114,7 @@
 
 		_staticBuffer = IOSurfaceCreate((CFDictionaryRef) [NSDictionary dictionaryWithObjectsAndKeys:
             @"PurpleEDRAM", kIOSurfaceMemoryRegion,
-            [NSNumber numberWithBool:YES], kIOSurfaceIsGlobal,
+            // [NSNumber numberWithBool:YES], kIOSurfaceIsGlobal,
             [NSNumber numberWithInt:bytesPerPixel*_width], kIOSurfaceBytesPerRow,
 			[NSNumber numberWithInt:bytesPerPixel], kIOSurfaceBytesPerElement,
             [NSNumber numberWithInt:_width], kIOSurfaceWidth,