well, first, I think ur comparison is not accurate and ur conclusion is not definitive. especially M$ windows Vista is not tied to a certain hardware as OSX does, so this comparison doesn't mean much for users
second, on my computers, XP IS slower than OSX at shutdown and startup. still, I have to think windows need more time during the booting to recognize, initialize and optimized for the hardwares, while OSX doesn't care about those very much. [for a simple example, linux startup process is slowest one, why OSX, which is build on the top of BSD would be drastically faster at startup? coz its tied to hardwares.]
Third, I just pointed out many apps, and the whole pace of OSX, is slower than XP.
Sorry, I can't say anthing about Vista, no first hand experience.
And by the way, I think boot up speed is more important than photoshop speed. Because including both Windows and Mac users, probably 5% (some number I made up, but it's probably less than that) use photoshop, and 100% of users boot up.
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huh, im just picking photoshop as an example, I hope u didn't think photoshop is the only situation.
I can't agree with your comparison, its about how much time u spend on the operation everyday, booting up, no matter how long, u only spend, say, at most, 20 minutes on it everyday, while u ormally use office, photoshop or any big software more than hours.
I didn't complaint about facts, i just complaint about ppl using unreasonable logic in trying to make a conclusion from their selective facts that may or may not be true.