Great update!
I'm running this updated version on an iMac G5 20'' 1.8GHz w/ 1.25GB of RAM, and everything definitely seems snapppier! And you know what was the first thing I tried to do? To check on the iTunes visualizer, because I still haven't installed any FPS games since I had to reinstall Panther. And... WOW! It doesn't drop frames anymore! It's finally usable, IMHO.
Besides, the updated Preview app is much better now!
If this simple update is that good, I'm starting to dream how Tiger will be 😀