This is quite annoying. I've now had to force my 27" i7 iMac off twice. I watch Activity monitor, and almost nothing is using any memory. I had finder completely freeze. And somehow I'm now missing a program I installed a while back that I didn't delete. I've used Onyx to do checks and try to speed it up, but at this point, there are times my Dual Core Macbook is faster. Ideas?