here is a chart that I found relating to battery life while running various internet browsers. Found here:
http://www.itpro.co.uk/web-browsers/24796/which-is-the-best-browser-chrome-vs-firefox-vs-internet-explorer-4 
The article itself is pretty up-to-date. It also states:
Chrome has a reputation for speed, and rightly so – it averaged a very nippy opening time of 0.05s. Interestingly enough, however, although Chrome was the fastest, Internet Explorer was hot on its heels, coming in just 0.002s slower. Firefox brought up the rear, with a time of 0.07s.
In practice, we’d defy anyone to notice a substantial difference between them. All of our browsers fired up almost instantly, with no significant lag when switching between pages; they’re basically identical in terms of speed.
But this is less than a second we're talking about, we're not wasting hours of our lives waiting for a browser to open here, but fractions of a second. Meaningless information, but rather interesting to see the results at least.
But according to that site, FireFox is the best.