Well, with 211 tabs open for a couple of weeks, I neither get CPU spikes, slow tabs, or a misbehaving chrome. This is not on a cutting edge PC. It's a core i7-

Well, with 211 tabs open for a couple of weeks, I neither get CPU spikes, slow tabs, or a misbehaving chrome. This is not on a cutting edge PC. It's a core i7-7700. Firefox's soft spot is DNS response speed. If your DNS is slow, Firefox is slow. Otherwise it's indifferent from Google Chrome speed-wise.