I am asking this because I think that can be cause of my stutter in games (strange problem, stutter after load, like some kind of memory causes problem). Like this in Mafia 2:
https://vimeo.com/236198005
When game is loaded I got 60fps ( I waited 5mn in place, game is always on 60fps - vsync) and in this case when I move mouse I got fps drop and small stutter, after that is ok.
I noticed if I turn Vsync off I have fps around 100 and when I move mouse fps fall to around 70 and I got stutter. When vsync is off fps from stable 60 will fall to ~47. Regarding that fps drop/stutter will always happen and even is it is way above 60hz.