Max memory, defragged hard drive, still seems slow

My 2GHz Core Duo Macbook seems to be running slow. I have 2 gigs of good ram, I defrag the hard drive and I don't use video software/ other rendering applications. I'm on 10.4.11 whatever could be the issue?

Which you can check by opening Activity Monitor. It may be that something you've put on is sucking up CPU. Printers can do this. Some widgets. Some system extensions.

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