could it be that making text-fragment parsing preffed off actually improved performance and the backout ended up having worse performance? In [Bug 1901799#c13](https://bugzilla.mozilla.org/show_bug.cgi?id=1901799#c13) you mentioned it is the backout that had the worse performance. I see that backout performance profiles introduced extra `mozilla::dom::FragmentDirective::FindTextFragmentsInDocument` calls, so backing out the preffing off actually made performance worse? Can you confirm if this is what might have happened?
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could it be that making text-fragment parsing preffed off actually improved performance and the backout ended up having worse performance? In [Bug 1901799#c13](https://bugzilla.mozilla.org/show_bug.cgi?id=1901799#c13) :fbilt mentioned it is the backout that had the worse performance. I see that backout performance profiles introduced extra `mozilla::dom::FragmentDirective::FindTextFragmentsInDocument` calls, so backing out the preffing off actually made performance worse? Can you confirm if this is what might have happened?