Look at your extensions
Only using ublock, and turning it off doesn't help. I have ublock enabled in private tabs too so I don't think that would be the issue.
What does the FF Task Manager show? Its under the more tools, possibly Shift+ESC (at least on Linux it is). Anything hogging your memory or CPU?
Edit: I missed FF Mobile, try about:processes
Nightly shows around 2.5% The other 3 are all under 1%
Do you have autosuggestions for search only on non-private tabs?
Looks like I get "Firefox suggestions" in both, but search engine specific suggestions only in normal tabs. It gives me an option to turn that on in private. Would that be the culprit? I'll try to turn it off and see.
Edit: turned it off, and doesn't seem to change anything. Private tabs are still noticably faster.
What is your CPU?
It's FF mobile on the s24+, whatever cpu this has should be able to handle it.
I've noticed slow Internet can significantly slow the client side UI for some reason. Perhaps something with the tracking or DNS is different in private and the additional network usage is causing it to lag
That's what I was thinking too. I might have to play around with the settings.
Firefox
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