ACC Optimization

Ok, so it doesn't matter if I have fast sync on or off. Either way, as soon as I disable vsync I get stutters - even though the FPS is constantly higher than my monitor's refresh rate. Note: stutters, not tearing. With vsync on, the game is a constant, smooth, 60fps.
I can't detect any input lag so I'll just leave vsync on, but this behaviour is confusing. Never seen it in any other game, but I don't own any other UE4 titles...

EDIT: by borderless do you mean full screen? Yes, I always run in full screen.

 

Pretty much the same here, I can run fairly decent fps around 100 but it's choppy, turn on vsync butter smooth, but then I get input lag, go back to about build 4 and everything ran smooth without vsync..

 

Just to reiterate my earlier post, without vsync the game runs at 70-100fps (never lower than 70) but is terribly choppy. With vsync it’s very smooth but dips down to 40fps every minute or so - the dreaded macrostutter. Both of those situations annoy the @#$& out of me. In every other game I own turning vsync off gives smooth performance but tearing. At this point in time I could live with the tearing just to have reliable stutter free fps.

 

Borderless windowed actually, it's an alternative for buffering but works similarly so may not help. You can select in game I think or add startup command in steam to test: -windowed -borderless.
Vsync sounds like best setup for you though - aint broke, don't fix .