Anyone who games at all can confirm this. There's a reason why no competitive starcraft player plays on OSX, despite it being available on that system. The lag is immediately noticeable. The acceleration curves are fixable and fine, but the input delay has led to enough frustration personally that I ended up installing windows on my MBP for gaming. It's a shame, I really like OSX as a platform, but these tiny hurdles stop hoards of gamers from touching it.