@Studer5544 - You aren't going to get consistent fps readings even with the Control Panel's vsync (it doesn't apply in windowed mode anyway). There will be frame rate drops. It's not really a problem usually, it's the poor old patched together game reacting to changing screen data as fast as it can and constantly playing catch-up. If you have WA, try visiting some of the more elaborate tombs and I bet your frame rates will drop as low as 20 or 30 on some of the levels. As long as the game performs well and looks appealing enough, none of this should really matter. If you start getting frame rates dropping down to something like 6 (when not in a WA tomb), then that might be worth paying closer attention to as the performance would then likely be intolerable.