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

[Noam Rosenthal]

On Wed, May 27, 2020 at 12:04 PM Yoav Weiss <yoav at yoav.ws> wrote:

> +Ryosuke Niwa <rniwa at webkit.org> +Alex Christensen
> <achristensen at apple.com> who were involved in the spec discussions.
>
> On Wed, May 27, 2020 at 10:29 AM Noam Rosenthal <noam at webkit.org> wrote:
>
>>
>>
>> Following up on this.
>>
>>> FOn Tue, May 12, 2020 at 10:28 AM Maciej Stachowiak <mjs at apple.com>
>>> wrote:
>>>
>>>>
>>>>
>>>> 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>
>>>> 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.
>>>>
>>>> So, can someone else from Apple review that the code is mature enough
>> for this? Simon had reviewed the original patch. Maybe Zalan/Darin?
>>
>> A helpful person from Apple may be able to set up an A/B test for this
>>>> patch.
>>>>
>>> What's required to ask for help from a helpful person at Apple? :)
>>
> Hola
Pinging about this again :)
The code for paint timing API is sitting there in the repo, waiting either
for internal Apple A/B tests, for an additional code maturity review, or
for enabling it by default... I'm here if any changes in the code need to
be made.

Trying to figure out how we can proceed with this... @Maciej Stachowiak
<mjs at apple.com>?
Cheers
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