I work between windows 7 and OS X on identical machines (dual boot) and it always strikes just how annoyingly slow windows is. This made me a bit curious, so I timed a few actions such as booting up applications, both photoshop and various web browsers. In every case on the exact same 15" rMBP with max specs every application took nearly twice as long to boot in Windows 7 as it did OS X. For example: Photoshop 120% longer in W7 Chrome 22 75% longer in W7 Opera 12 115% longer in W7 Firefox 15 100% longer in W7 I couldn't reliably duplicate a good way of switching between applications and timing it accuratly but OS X also seems to do this around twice as quickly. Can anyone explain why there is such a significant difference?