I'm currently running a Late 2010 2.13GHz 13" MacBook Air - beautiful machine. However, I've just began encountering a massive issue. When I boot the MacBook up normally it works flawlessly. Everything is silky smooth and works the way it should. However, when I put the MacBook to sleep, and subsequently wake it up again, the graphics (and come to think of it, the computer in general) is significantly choppier and slower than it was before the computer went in to sleep. I've run the AHT and nothing shows. I've reinstalled various versions of OS X and the same issues arise. Any idea on what this could be? Could it be a voltage regulator issue? Thanks in advance guys.