So I picked up this Machine off of eBay, was bought in August 2011 so there is AppleCare still left. 15" 2.2 Ghz, 8 Gb ram, high-res anti-glare. This thing beach balls all the time, whether I'm writing a simple post or just growing the internet. It's becoming really frustrating. I have safari open and that's it and I just don't understand why the damn thing is slow. Any ideas on a fix?