Speeding up my Apple iMac?

[Schweppy]

I have a previous gen white iMac, 2.16ghz processor and 2.5gb RAM.

I think i can max out the RAM at 3gb but that wouldnt be much different to what i have now.

Anyone know any other ways to speed it up?

 

[Tom]

Go to disk utillity and check the permissions.

 

[Schweppy]

I do this every now and then but dont really understand why. LOL

What does it actually do?