@dan_abramov Updating react{,-dom} from v15.4.0 to v15.6.1 in its Speedometer test boosts perf by a factor of 10: https://bugs.webkit.org/show_bug.cgi?id=175715 …
element.dispatchEvent(new Event('change', { bubbles: true, cancelable: true }));
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Yes,
@monasticpanic changed how onChange polyfill works. -
https://github.com/facebook/react/commit/045f1a791c6e17253e9d927ffca70ae5d00b4fe5#diff-2bead3a73555ca476b3dedf1f31fbb93R68 … matches the behavior that I’m seeing. However, I’m testing v15.6.1, which doesn’t seem to include this change

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Have you tried 16 beta?