[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 #11 from Darin Adler <darin at apple.com> ---
(In reply to Antti Koivisto from comment #9)
> > 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.

Seems to me that this optimization for this issue is so huge, it lends itself to a fast test that would simply hang without the optimization. Maybe that’s not right?

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