@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 …
Looping in @sebmarkbage & @soprano — any idea what might be causing this massive difference?
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No idea. Have a flame chart or profile comparison?
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.
Have you tried 16 beta?