I'll be honest, I really don't get how a high framerate would actually cause problems in-game, but.
I have a monster gaming rig, and apparently going over 180 FPS causes severe jittering to other people. I don't reduce my graphics or anything, it's all capped out. Is there anywhere I could find VSync to turn that on? Or any way I could cap my framerate?
You may notice some mouse lag at 60 FPS however, to me the mouse feels a lot more sluggish and imprecise at 60 FPS. Just fix FPS to 120 or so, that should neither cause mouse lag nor jittering.