My wife has a MBP G4. It is steadily decreasing in speed which is very frustrating since she uses it for her online master's program. Are there any tricks for getting the speed higher? I have tried Maintenance and completely erasing/reinstalling then restoring her TM backup. She has plenty of HD space free and doesn't install any junk applications. It has slowly gotten to the point where it takes 45 seconds to open iTunes. Help!