I run 10.6.6 on my late 2009 unibody MBP. I've been using it for over a year now and it has become noticeably slower when performing day to day functions and starting/closing applications. I find myself using 'force quit' more often than I'd like. I'm a mac user of about a year and a half, I know unix alright, but I never really delved too deeply into experimenting with my mac boxes. The rainbow-wheel shows up a lot. It has become a real pain when browsing the web, using word or any of my CS5 apps. In the beginning, Photoshop for instance, would load all the tools instantaneously. Now when I click the [T] alone "initializing type tool"tends to take up to twenty seconds. Problems were especially bad in Chrome, so I switched to FX4 and the browsing experience is a lot more manageable. What's going on here? Are there maintenance procedures I can employ to minimize the rainbow wheel?