What more can I say? MacJanitor is the best at running the maitnce scrips, which usually will only run at night when your computer is idel. Run this program monthly and you will see the huge preformance boost.

Warning for intel iMac users: Because this program is still for PowerPC chips, there is sometimes a few glitches. For example, the program is supposed to close when the cleaning is done, but often it won't. You can still tell when it is finished however: the word DONE will appear in the progress text box. Once done is shown, you can safley shut down.