This browser speed test on Mac OS X, which is on the Chimera site, shows Chimera to be the speed champion. I can’t remember the last time that brand new beta software was so substantially faster than the established industry players. I was using it for a couple of days on my TiBook, and can say it was much faster at rendering pages than the other Mac OS X browsers, but also is not complete yet. (Oh and they released a new version on Friday too.)