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This is M70 and I don't know who's a good owner... @chrisha/rpop : any idea who may have tweaked the "Page Unresponsive" dialog's heuristics recently?

I'm suspicious of tab freezing/discarding. Adding bisect flag to get some help.

Yeah I have similar suspicions (backgrounding of some sort at least because focusing the "unresponsive" tab usually results in the dialog going away)... Couldn't get a hard repro though so bisect will be hard (and many of these things are in flux behind Finch).

I heard some team was tweaking this dialog's heuristics, that was my only other hope.

https://bugs.chromium.org/p/chromium/issues/detail?id=881812#c2 hints that this may caused by a new M70 tweak for site isolation

Friendly ping! Could you please provide any update on this issue as it has been marked as a stable blocker.

Thank You!

Merging into  issue 881812  where most of the discussion is happening...