With browser.tabs.remote.warmup.enabled set to true, my tab animations become very laggy/janky on MacOS. It seems to be most notable with pinned tabs. STR: - Pin several "heavy" sites (I have gmail, calendar, slack, ircloud) - Move the mouse across these tabs a couple of times The hover effect starts to fall behind where the mouse is actually located and I see the top border animation very slowly animate. My CPU usage from Firefox also shoots up to 100%.
Hey bdahl, do things improve if you set browser.tabs.remote.warmup.maxTabs to 1 (and then restart)?
Flags: needinfo?(mconley) → needinfo?(bdahl)
It's better, but I still see the animation/hover fall behind occasionally. Not sure if it's helpful, but here a profile with maxTabs at 3: https://perfht.ml/2qq7qRe
In case they're useful, here's some profiles from my potato-grade 2016 12" MacBook: Me scrubbing the tab bar with warming enabled: https://perfht.ml/2IszjlO Me scrubbing the tab bar with warming disabled: https://perfht.ml/2IqQ29i
Hey bdahl, with bug 1265824 having been fixed, I suspect this has probably gotten better. It has for me, anyhow. Can you confirm?
Depends on: 1265824
Yeah, seems very smooth now!
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