micartu: It's a V-sync problem. Try to force the v-sync externally, from your driver video control panel.
And deactivate it in game if there is an option.
Then play at full screen.
Some advise:
-Amd owner will have lag and problem even in game because this game isn't fully compatible with the amd processor, Kaiko is preparing a patch
-windows 10 owner will have probably worst performarce than windows 7 owner.
-some people even forcing v-sync can't fix that problem, that depends even from your personal hardware+driver combo
-if you have low-end or medium-end configuration, fixing by yourself that problem could me a little bit problematic. obviously if you own a notebook or a desktop with an old video card things could be more difficult.
-kaiko is trying to fix even that problem of de-sync.
I thought it was vsync related, but was too lazy to make some tests :P . I never enabled vsynch though, kept it disabled while playing in borderless, getting 95 fps more or less with some fps drop at certain points (mostly due to port unstability, it doesn't matter when or what i do).
