This weekend I upgraded my late 2010 13 in air, and my 27 inch i5 iMac. Both of them are now crawling compared to how they were running on snow leopard. I have moments where they freeze for 10+ seconds. I constantly have to go into activity monitor and keep just the essential programs running. In snow leopard I never had this issue. Both of these machines only have2 gigs of ram. Was it a mistake upgrading? I did the standard upgrade instead of a fresh install. Has anyone else experienced the same issues, if so has doing a clean install helped? I am seriously considering going back to snow leopard from my time machine backup. Any help would be appreciated.