It’s behaving essentially the same in edge inside a windows vm too.
I have opened up Brave browser (back in linux again) so I could see a chrome devtools similar to the one you posted, and low and behold it’s seeming to run quite well in there (for now).
I’m am 100% certain that this was occurring in Brave in May though, as testing in a different Browser is an obvious thing to check.
So, currently, Edge in windows has the issue, Firefox in Manjaro has the issue, Brave in Manjaro doesn’t (but has done before).
I half expect that if I continue with Brave I will see this occur at some point.