Currently Being ModeratedOct 16, 2012 9:51 AM (in response to Daniel tzhenyao)
Cache files exist to make your Mac run faster.
I use Disk Doctor ...
Norton Disk Doctor? That piece of junk was discontinued ages ago. Get rid of it.
Whatever you do, do not download or install any product claiming to "clean up" or "speed up" or "optimize" your Mac. Without exception, they will do the opposite. If you already did, you found the problem. Fix it.
If you're experiencing general slowdowns or "freezes" unrelated to Internet activity, the problem may be related to your computer or the software you installed and is something you may be able to fix, or at least improve. Aside from hardware failures and software that you install, including OS upgrades, there is no reason that your computer should not work exactly as well as the day it was built.
Read the following to determine if something may apply to your concern:
General Mac maintenance (including how to clean it): Tips to keep your Mac in top form
General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
Identifying resource hogs and other tips: Runaway applications can shorten battery runtime
To identify potential hardware problems: Apple Hardware TestMacBooks iMacs iPods AirPorts, OS X Mountain Lion, 27 years Apple!