TenFourFox for my PowerPC Macs.
Firefox for my Intel MBP.
I hate Safari and I hate Chrome, but for different reasons.
A default install of Firefox/TenFourFox/Mozilla isn't optimized for speed. The dev(s) have to have settings that apply for the widest possible pool of users on the most common types of platforms and setups.I was a long time Firefox user on my previous MBP (2009) but I have been seeing that its one of the slowest browsers. Safari seems nice and snappy so far. I guess the only way to test the speed is to download it myself.
Internet Explorer