I play on a MAC too and I don't have those problems...I do have a glitch once in awhile, but name a pc that doesnt glitch. I chalk it up to it is a computer and they are made by humans so there is bound to be a few problems. I think it all depends on what kind of mac you are on. My old g3 has alot of problems. Maybe it is the 300 mghtz. My newer g5 is really smooth.
Etinfall