Originally Posted by Darvin
What you want to look at are benchmarks. The ones I've seen have put all three Windows in the same range. Aside from OpenGL support (one of the only places that XP definitively outperforms both Vista and 7) they're virtually indistinguishable. Most of the ones I read put 7 ahead of its predecessors overall (that's to be expected) but not by any considerable margin.
Bottom line is that your hardware is going to mean a hundred times more than your operating system towards what performance you will get out of the game.
Yes I know that. I am upgrading my laptop to windows 7. I was just pointing out something that a lot of people don't know about and bash (not that you were). I found XP worse the vista. I also know that benchmarks don't me anything if you can't run the program either.