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What exactly is slow? You could try repairing permissions with Disk Utility and a reinstall of OS X never hurts
 
Outside of upgrading to a 7,200 RPM HD or SSD, or adding more RAM, there's not much else to do.
 
The key question is faster in what sense? i.e. what slowness are you experiencing?

Throwing money into RAM or SSD, while good for the economy, is sort of a haphazard approach if you don't first define the specific problem you're trying to address. :D
 
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