uBO's mutation observer receives a list of 605,502 mutations, so I gather that any extension which install a mutation observer is going to suffer some performance issue. For some reasons, the breakpoint I add to the mutation observer code is not triggered in neither Firefox nor Chromium, so this makes it difficult to find out if there is anything of interest in those mutations. I did add code to report the number of mutations though, and it's clearly huge.
Bug 1956850 Comment 3 Edit History
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uBO's mutation observer receives a list of 605,502 mutations, so I gather that any extension which install a mutation observer is going to suffer some performance issues. For some reasons, the breakpoint I add to the mutation observer code is not triggered in neither Firefox nor Chromium, so this makes it difficult to find out if there is anything of interest in those mutations. I did add code to report the number of mutations though, and it's clearly huge.
uBO's mutation observer receives a list of 605,502 mutations, so I gather that any extension which install a mutation observer (edit: and iterate through the mutations) is going to suffer some performance issues. For some reasons, the breakpoint I add to the mutation observer code is not triggered in neither Firefox nor Chromium, so this makes it difficult to find out if there is anything of interest in those mutations. I did add code to report the number of mutations though, and it's clearly huge.