It looks like all six tscrollx/tp5o_scroll signatures have returned to their pre-regression baselines as of bug 2044211 ("Refactor text runs to store glyphs with device offsets"), which removed the per-frame text-run snapping cost introduced here. Resolving. https://bugzilla.mozilla.org/show_bug.cgi?id=2044211
Bug 2044901 Comment 3 Edit History
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It looks like all six tscrollx/tp5o_scroll signatures have returned to their pre-regression baselines as of bug 2044211 ("Refactor text runs to store glyphs with device offsets"), which removed the per-frame text-run snapping cost introduced here. https://bugzilla.mozilla.org/show_bug.cgi?id=2044211