With Windows XP Pro running on a 2.0GHz iMac Core Duo, we ran our Photoshop test in less than half the time it took with the same system running OS X 10.4.5: 2 minutes 49 seconds versus 6 minutes 30 seconds to be exact.
The reason is that while Photoshop on Mac OS is currently not optimized to run on an Intel chip on a Mac system, the story is not the same when you run Windows XP on the Mac's Intel processor. The report adds that an Intel iMac beat Pentium D PCs from Dell and Gateway when running Photoshop on XP.
I am always the Fan of Microsoft products. Now i am try Vista. My feed will come later 
