[quote]GRAPHICS] (not DISPLAY) add this:ForceFullScreenVSync=1And yes, its 1, not 'True'and set your driver to let the application manage vsync. just tested now with my nVidia card, and I can confirm it works. Can an ATI user test? I tested also in my laptop which uses a crappy intel card and it also worked... so either I'm completely dilusional or this is one of those 'miracle tweaks' (for ATI users) test and report. Please I know this is going to sound a bit stupid but where do I find the file to adjust the ForceFullScreenVSync.Is this in the main FSX file somewhere. If it is I cannot find it