Paracab,
It depends mainly on what type of sites you visit
, and if you want to totally delete all evidence of your internet activity.
Cyberscrub has quite a lot of features.
You can totally delete files or folders, so that they can never be recovered,
scramble the free space on your hard drive, (something that you should always do, when disposing of a computer),
It will also delete and scramble anything in your recycle bin, and get rid of of any Windows info (recent doc's etc).
I might be wrong, but I don't think that there is any performance increase in using Cyberscrub, as all you are doing is scrambling old data, and not actually recovering any space on your PC.