Could you say more why you would like to experiment on 50% of stable, vs
requesting permission to ship? That's quite a leap from 1% - and it
seems you already have results demonstrating performance improvements.
Also, mind answering the question of specifying "unimportant frames"?
On 2/27/24 5:54 AM, Zheda Chen wrote:
fdoray@ launched this trial since Nov 2023, at first canary/dev, and
then beta, 1% stable. The experiments show statistically improvements
to CPU time on navigation, page load time and input delay.
So we are requesting to experiment on 50% stable as next step.
Actually the feature should be in origin trial stage now. But I don't
have the permission to add origin trial stage. I have to use dev trial
instead. Need some help from webstatus-request@ to grant me the
permission.
On Tuesday, February 27, 2024 at 8:53:34 AM UTC+8 mike...@chromium.org
wrote:
Hello,
To clarify: is this intended to be an I2E, or a Developer Trial?
According to https://chromestatus.com/feature/5106220399853568, it
appears you are in the dev trial stage. But you mention stable
experiment below... so perhaps that's a process mistake?
Can you give more info on the experiment timelines and what stable
percentages you are requesting permission to experiment on?
On 2/22/24 2:30 AM, Zheda Chen wrote:
Contact emails
zheda...@intel.com, fdo...@chromium.org
Specification
https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html
Summary
Align wake ups of JavaScript timers for unimportant cross-origin
frames. Currently, DOM timers <32ms are all opt-out from
AlignWakeUps [1] due to performance concerns. This is very
conservative and actually some unimportant frames are eligible to
use JS timer alignment. WebKit uses the policy to align DOM timer
of non-interacted cross origin frames to 30ms. This feature adds
JavaScript timer wake up alignment for unimportant frames on
foreground pages. Unimportant frames means they are cross origin,
visible but have small proportion of page’s visible area, and
have no user interaction. [1]
https://chromium-review.googlesource.com/c/chromium/src/+/4589092
Do you have plans to specify this concept of "unimportant frames"
somewhere?
Blink component
Blink>PerformanceAPIs>Timers
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EPerformanceAPIs%3ETimers>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
None
/Gecko/: No signal
/WebKit/: No signal
/Web developers/: No signals
/Other signals/:
WebView application risks
Does this intent deprecate or change behavior of existing APIs,
such that it has potentially high risk for Android WebView-based
applications?
None
Goals for experimentationWe plan to experiment on stable to
confirm whether we observe same performance improvement as on
lower channels and similar power benefit as in the lab. We will
decide whether this feature ships based on the experiment data.
Ongoing technical constraints
None
Debuggability
None
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
Flag name on chrome://flags
None
Finch feature name
ThrottleUnimportantFrameTimers
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/40942028
Estimated milestones
DevTrial on desktop
122
DevTrial on Android
122
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5106220399853568
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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