Chrome has gone from the 'fastest' (whatever that means) and 'leanest' (ditto) to one that has the (penultimate) worst cold start times[1] and worst memory efficiency[2].

[1] http://www.tomshardware.com/reviews/chrome-27-firefox-21-ope...

[2] http://www.tomshardware.com/reviews/chrome-27-firefox-21-ope...