mystikz2002,
Uh, adds performance? I don't think so. If your ground connections are dirty or unstable your engine won't run properly, but having them clean and tight will get the thing running the way it's supposed to.
I think there are two grounding points, one on the starter of course and the other on the valve cover. Both go to a nearby section of the frame.
Make sure you clean down to bare metal where you are bolting the ground wires to and a dab of di-electric grease certainly won't hurt anything. I'll usually use the Dremel to clean off the paint and get a good ground.
Bogatyr