... Firefox by a relatively small margin. Indeed, in some areas, Firefox is slow, other areas, such as Javascript, Firefox is, at best, middling.
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At this point, if you are deciding upon which browser to use, perhaps the browser with the marginally highest performance benchmark numbers may not be the browser for you.
Here is a difference that matters more to me: when I change the http proxy settings in Firefox, only Firefox is affected. However, when i change the http proxy settings in Chrome, the proxy settings for Windows are changed, meaning that other applications are affected. For this reason I use Firefox instead of Chrome, even though Firefox is a lot slower on a web page I frequent a lot.