the most games starts with vsync off, because a lot of gamers mean, they can notice the possible 10ms input lag 
… some users , which dont like vsync use the trick and set max-fps = monitor-fps ( or 2-3fps less). Then you can avoid vsync usage and get no tearing and never see 500fps. ( but again: the LPW need vsync.on if you want getting all features )
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