- last post: 01.01.0001 12:00 AM PDT
Nobody explained vsync...
VSYNC forces the graphics card to stay at the monitor refresh rate, usually about 60Hz. Well, even if you are under that, that extra load of checking to make sure there are less than 60fps is taxing on your system, and if you don't have a very fast one, you will see jerky movement and not get a smooth picture.
My advice is to leave it off, since it does take up a fair amount of CPU/GPU power, which you don't want to sacrifice in all but the highest systems.