It looks like it is taking hundreds of ms to `insertText` and `deleteBackward. "Stack Chart" during the red jank bars shows long sections of time stuck "within" these call stack, though it seems to fractal out to a lot of different (minified) JS further down the stack chart. This feels like the website behaving badly. Alternatively/possibly we are missing an optimization that other engines have that makes it preform poorly for us, though?
Bug 1899468 Comment 3 Edit History
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It looks like it is taking hundreds of ms to `insertText` and `deleteBackward`. "Stack Chart" during the red jank bars shows long sections of time stuck "within" these call stack, though it seems to fractal out to a lot of different (minified) JS further down the stack chart. This feels like the website behaving badly. Alternatively/possibly we are missing an optimization that other engines have that makes it preform poorly for us, though?