How to Increase the Speed of a Macintosh Computer

Step1

Rebuild your desktop once a month by holding down the Command and Option keys as you restart your computer. Leave the keys pressed until the computer asks if you want to rebuild the desktop. Click OK.

Step2

Remove fonts you never use. (Open the Fonts folder in the System Folder and drag the fonts out.)

Step3

Open the Extensions Manager control panel and turn off system extensions you don't need. For example, if you're not on a computer network and don't have a printer, you can turn off printer drivers and file-sharing extensions.

Step4

Purchase and install speed-increasing software, such as SoftwareFPU from John Neil & Associates, Speed Doubler from Connectix, and Norton Utilities from Symantec.

Step5

Add RAM if your computer takes a long time to open programs and slows down when working with multiple programs or large files.

Source:Ehow.com