Interesting. I also have a question re vSync. In full screen mode, the fps changes directly to the screen refresh rate. If refresh rate is 75 the fps will also be 75 etc.

But, when using vSync, do I set the timer interval to 0 or do I set it to for example 1000 div 200? Will this have any effect? Anyway my movement is time-based so it should be the same on all pc's when using vSync?