Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
It should be fine, I have a 1.5ghz PBG4 12" and it still seems snappy on Leopard. Sure its not blazing fast, but its more than fast enough for most things.

In fact most of my friends still think I have a new iMac even though its 4 going on 5 years old G5 iSight.

I even have an old dual USB iBook G4 running Tiger that most people still find more than fast enough to use on a daily basis.

No computer should feel slow as long as it has the right software.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.