Windows 7 is faster on the same machine than XP for me. The hardware was not changed at all. I'm running on a Pentium 4HT with 4 gigs of PC5300. I did a fresh install of XP a month ago and did a fresh install of Win7 64bit this week. Boot time is faster and the machine over all seems snappier. I ran Windows 7 in a virtual machine on an XP host ( different machine, Core2Duo with 2 gigs ram) and Windows 7 booted faster than the host XP OS.