I use Windows 7 and it's brutally fast. I don't have any problems with it.
If you're not getting the speed you want, try reinstalling. Not only that, but try using a PC that wasn't designed with the XP era in mind. Remember, XP is old tech and SO many cool things in Win7 simply don't exist in XP. Windows 7 makes me more productive as I can search quicker, move files easier, use newer better apps that aren't XP compatible etc ...
Windows 7 is better. Fact.
