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I have the complete opposite experience. Firefox runs smoothly even when I have 150+ tabs open in 4-5 windows. Meanwhile running 20+ tabs in Chromium bogs down my system so hard that the mouse can start lagging.

To be fair it runs very nicely when not excessively tabbing everything, but that's just how I prefer to use the web.

Same. Firefox gets bogged down debugging one of our more complex websites. Was quite surprised when chrome didn't. Figured all the speghetti meant it was doomed either way.

Yeah, I've found that Firefox is fine (even better than Chrome) on simple websites. But it gets bogged down on complex sites like Facebook or Gmail.

Firefox gets bogged down in Gmail by some sort of tracking pixel or something, and it's noticeably improved by content blocking.

still laggy for me too but the lag factor is now lower than the google-annoys-me factor