[webkit-dev] Suggesting to enable paint timing by default

Maciej Stachowiak mjs at apple.com
Tue May 12 00:28:29 PDT 2020

> On May 11, 2020, at 9:53 PM, Noam Rosenthal <noam at webkit.org> wrote:
> On Tue, May 12, 2020 at 1:36 AM Maciej Stachowiak <mjs at apple.com <mailto:mjs at apple.com>> wrote:
> I noticed from comments in one of the Radars that the patch may result in an additional “fake paint”, so it should probably be performance tested. Have you done any testing?
> I've tested it locally, I haven't noticed any significant side effect, because in complex situations the fake paint only happens once per page and bails early once contentfulness is detected. but I can run any additional test needed.
> We’ll likely want to A/B some of Apple’s page load speed benchmarks.
> A/B testing load speed sounds sensible. How do we go about doing that?

Unfortunately our page load speed benchmarks are not public because they incorporate captured page content, which we can’t freely redistribute.

A helpful person from Apple may be able to set up an A/B test for this patch.

 - Maciej

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