Hi, Just wanted to share my experience. In May I sold my 2.66 GHz Core2Duo Macbook Pro and bought a 2.53 GHz Core i5, but was pretty unimpressed by the new laptop's perfomance on the Mac OS X side (Windows 7 gaming was much faster). There were no noticeable perfomance gains, even after running Onyx. The laptop was much snappier after I bought and ran CleanMyMac on Sunday, though. Even Safari 5 doesn't really hang anymore. Yay CleanMyMac! Has anyone had the same experience?