We are always reading about things we should do,without really questioning whether we need to be doing them in the first place.
Well several of those things listed DO IN FACT help things!
Cleaning Prefetch files IS ALWAYS A BIG HELP IF YOUR ON XP,ETC that uses Prefetch!!
And cleaning your registry is a big help also.. (The cleaner your reg is OF UN-NEEDED things,the faster response you will notice (Its like keeping your dresser drawers neat and in order))
I do agree with this on the page
"Disabling Shadow Copy/System Restore Improves Performance"
IT IS STUPID TO DISABLE THIS...YOU SHOULD ALWAYS HAVE @ LEAST 1 BACKUP IN CASE YOU NEED IT!