Techniques Regarding Improving Performance of Mac OS X

"You really don't need to do all that at all.

Since most OS X applications don't install by putting files all over the drive, you can generally uninstall an app simply by deleting it from the /Applications or ~/Applications folder. The rare application that needs one should include an uninstaller (and again, this is rare).

There is no registry to manage.

HFS+ doesn't require manual defragmentation.

You're best letting the OS manage the virtual memory (as you indeed are in most XP configs as well).

If you're looking for something like BoostXP to manage lots of hidden settings, etc, try OnyX."