Profile with broken code shows massive jank and very long requestAnimationFame callback running times. Most of the time (72%) is spent in a single wasm function (labeled "612"). Profile with good code has none of those problems, it's mostly idle.
Bug 1708381 Comment 4 Edit History
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Running Ion-only: Profile with "bad" code shows massive jank and very long requestAnimationFame callback running times. Most of the time (72%) is spent in a single wasm function (labeled "612"). Profile with good code has none of those problems, it's mostly idle. Running baseline-only, the profile for the "bad" code resembles the Ion profile for the "good" code, there's no jank, animation callbacks are 11-14ms.