I was practicing around Spa with the Z4 last night and I'm always one for using vsync on my games. The time I was setting (Slow as per normal) but I tried some different settings and it was maybe down to me getting better but I turned vsync off and was getting 4 to 5 seconds a lap quicker. Surely without vsync can't make that much difference but If it does, how can it be. Cheers