Re: preformance difference between service pack 1 +2
SP2 is loaded with newer WIndows Updates and a bunch of secutiry feature like the new Windows Security Center which I really like. It integrates that with Windows and it even has a virus protection!!!!
It has a new pop up blocker which is pretty neat to see. I can hear the little Blurp when it blocks something. It has an enhanced firewall version compared to the firewall in SP1 or original Windows XP. Wireless connectivity is more secure as well because I have a wireless network.
You can see all this protection can slow up your computer a bit, but I hardly notice a difference.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?