I, like many people, have been dealing with constant beach balls in Snow Leopard. I was getting really frustrated after two clean installs. The performance update made no difference. So I swapped by old 160 gb drive back in (I was using a 500 gb, 5400 scorpio blue) and reinstalled Snow Leopard. Bingo... no beach balls at all. This sucks though, because I don't know what to do with this 500 gb drive drive now. With my photo collection I have barely any space on a 160 gb drive. Should I just get a 320 gb drive? I don't have to waste any more money on this issue... Did this "performance update" actually resolve anyones beach ball issues on snow leopard, and did you guys have 500 gb drives? Thanks!