Anecdotical I know but on mac, when using velocityjs to change the css transform value (translate, scale and rotate) of 100+ spans, Safari is faster and the animation is smoother than Chrome. I've tested that on an imac, a macbook pro and a mac pro. Also, they don't mention in the benchmark you've linked if they're benchmarking the windows version or the mac version of Chrome. The windows version is faster in quite a few cases in my experience.

Finally, while Chrome definitely has a better html5 compliance, there's one thing I hate about Chrome. It doesn't keep the state of the previous page when using the back button unlike Firefox, Safari and IE. See this: https://bugs.chromium.org/p/chromium/issues/detail?id=2879

Err, I didn't say anything about any browser. I said that performance and battery life are not at odds, they often go hand in hand.

Efficiency and energy use go hand and hand, performance and energy use often do not.