Re: Unreal Tournament 3 Beta
Vsync basically forces the video card to only send frames on every refresh of your monitor.
So if your monitor is set to 60hz, your video card will be sending exactly (if it can handle it), 60, and only 60 frames per second back.
This prevents tearing in shooting games, etc, where if you move fast, half the screen seems to be between 1 frame and another frame because its running faster than the monitor can refresh between.
Its best to have it off at most times, as it also slows down your average frame rate.
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