Setting pre-rendered frames to 2 or 3 can help with stuttering without causing input lag, imo. I don't get any non-FPS related stutters, in fact some KS tracks such as Monza are heavier than LuccaRing in places. i5-3210m, 630m with 2 GB dedicated. I have all graphics down to off/minimum @ 720p to get 60 FPS, that's how bad the GPU is.