I'm hoping I understand what you mean here by "overall computer performance" isn't processing power but more general usability:
The thing I’ve noticed the most with my Raptor (74bg), is that my computer generally is more “Snappy” (that’s the best word I can think of to describe it at the moment) It's most noticeable when opening programs, files, mp3's, videos etc.
Raptors are good drives to store the operating system on.