you just need to make sure you get more fps than your screens refresh rate, then you wont have such problems.
my screen is 60hz and my fps stay at 60 all the time with vsync enabled.
and yes vsync does a lot, it gets rid of tearing, but if your frame rate is lower than your refresh rate there is no need for vsync as it chops your fps in half and you dont get much screen tearing with low fps anyway.
screen tearing is generaly more noticable when your frame rate is higher than your screens refresh rate.
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