Problem: Macintosh running slow
If your Macintosh computer is running slow,try the following steps:
Step 1: On your Macintosh computer or laptop, perform a PRAM reset. Save your work. Shut down the computer, turn it back on and immediately hold down the Command-Option-P-R keys.
Step 2: Start the Mac in safe mode by holding the shift key as you restart. Let is start up, then restart again normally.