Snappy behavior depends on a lot of things: which sites you're on (some browsers are better at some sites than others, and none is great at all of them), multip

Snappy behavior depends on a lot of things: which sites you're on (some browsers are better at some sites than others, and none is great at all of them), multiprocess separation (e10s in Firefox, on in Nightly and it really helps a lot), your graphics card and whether the browser has blacklisted it, and of course if you happen to hit a rare perf bug (which all browsers have, not surprising given the amount of constant code churn).