[Webkit-unassigned] [Bug 226764] Complex flex layout is very slow to load

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226764

jonesr at gmail.com changed:

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--- Comment #6 from jonesr at gmail.com ---
On the latest safari technology preview (127), the fiddle takes nearly 20 seconds to load on my 2017 15" Macbook pro. I would assume this STP version will have the fix for https://bugs.webkit.org/show_bug.cgi?id=222202 ?

Default safari (14.1.1 on my machine) is about the same speed.

We are seeing similar load times on some of our flexbox heavy pages, but unfortunately don't have a cleanly extracted test case yet. STP is better for our problem, taking around 8 seconds to render versus nearly 60 for Safari 14.1.1. When benchmarking it appears all the time is spent in layout , basically we put a timer around something like console.log(foo.offsetHeight); which triggers layout, and we are blocked for nearly a minute on Safari 14.1.1. We have an insanely large DOM, but Chrome and Firefox are handling this particular case without a problem.

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