If you're a Firefox user and a Mac user, you may be interested to know that Neil Lee has compiled versions of Firefox 1.5 optimized for G4 and G5 processors. If your Mac has a G4 or G5, install the corresponding optimized build to see a bit of a boost in peformance. For PC users there's usually the good old MOOX builds, but the MOOX site is down until the 5th.