I think you'll find that the performance improvement is not worth the hassle. If you can actually notice a performance improvement I'll be quite surprised. Of course, if you have some background task chewing up resources it might be good, but I'd address that problem by finding out why a process is doing that before using some utility to "optimise" performance.
Actually. It is worth the performance improvement, since the game have a memory leak that's caused by AMD Multi-processors, with the utlity enabled i don't need to wait 15-30 min for the loading to finish..