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

Noam Rosenthal noam at webkit.org
Mon May 11 21:53:16 PDT 2020

On Tue, May 12, 2020 at 1:36 AM Maciej Stachowiak <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?

> I’d like to hear from others on maturity of the spec and readiness of the
> code.

>  - Maciej
> On May 11, 2020, at 11:44 AM, Noam Rosenthal <noam at webkit.org> wrote:
> Following the discussion with Simon in
> https://bugs.webkit.org/show_bug.cgi?id=78011
> Since we have a pretty stable spec (https://w3c.github.io/paint-timing/),
> lots of passing web platform tests, other browser vendor support and a
> working implementation of first contentful paint, I am planning to submit a
> patch to enable paint timing by default.
> https://bugs.webkit.org/show_bug.cgi?id=211736
> Any objections? Other thoughts?
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