[Webkit-unassigned] [Bug 229680] REGRESSION (r272900): wpt.fyi loading performance is very slow (regressed, and slower than other browsers)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229680

--- Comment #9 from Antti Koivisto <koivisto at iki.fi> ---
> Any good way to regression-test this performance optimization? Maybe we
> could make a test that is *super-slow* if this is broken.

Those sort of benchmark is layout tests have often been problematic (hard to make reliable and speedy enough). We definitely should have coverage in our regular performance tests for Shadow DOM as it is getting increasingly popular. Speedometer3 is apparently planned to have some. It might also make sense to add microbenchmarks.

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