Mozilla's Kraken has just convinced me to switch my browser... to chrome. It's a shame Firefox doesn't understand that browsers should be designed to actually be used by humans.
Firefox Test: I start up Kraken in Firefox. Immediately the window becomes nonresponsive for a few seconds, and I'm unable to use mouse-gestures to return to my slashdot tab, forcing me to manually switch. Then my performance in another tab is so severely impacted it becomes a chore to even attempt to read the article, as I'm unable to even scroll down without several second delays. I try to minimize the window resulting in a ridiculous delay, then attempt to maximize the now-nonresponsive Firefox, again getting an even greater delay. It's a pain to even try to close the offending tab while all this is going on. Finally Kraken is halted and I'm in control of my own computer again.
Chrome Test: I start up the test in Google. No lag, no delays, no horrible loss of control of the browser. It seems to be taking significantly longer (still not completed), but I can *gasp* actually use my browser! What a novel idea.
I'd much rather have a great time on a browser that I'd actually want to use, than a terrible time on a slightly faster platform.