Window occlusion and performance throttling feature status

Skip to first unread message

Chris Davis (EDGE)

May 13, 2020, 11:09:52 PM5/13/20
to Chromium-dev

What is the status of the throttle on occlusion feature? I know there were issues when this was first enabled in Stable in November – have those been addressed?  I’m really looking forward to the perf wins here for battery life.


Calculate window occlusion on Windows

Calculate window occlusion on Windows will be used in the future to throttle and potentially unload foreground tabs in occluded windows – Windows




Enable occlusion of web contents

If enabled, web contents will behave as hidden when it is occluded by other windows. – Mac, Windows




David Bienvenu

May 14, 2020, 10:15:13 AM5/14/20
to, Chromium-dev
Hi Chris,
  Yes, the Remote Desktop issue was fixed in December, and we're planning on re-launching in m85.

  Note that web-contents-occlusion is on by default in the code. calculate-native-win-occlusion is what we're planning on launching.

- David

Chromium Developers mailing list:
View archives, change email options, or unsubscribe:
You received this message because you are subscribed to the Google Groups "Chromium-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to
To view this discussion on the web visit

Chris Hamilton

May 14, 2020, 12:55:55 PM5/14/20
to, Chris Davis (EDGE), Chromium-dev
As a small follow-up here: we prototyped "frame" level occlusion, which would track partial occlusion of windows resulting in full iframe occlusion, and disable painting/layout for those iframes independently. We expect to see another small bump in the gains here, but we'll first build metrics to track how often this occurs.



Chris Davis (EDGE)

May 14, 2020, 6:27:36 PM5/14/20
to Chris Hamilton,, Chromium-dev

Thanks for the info.



Reply all
Reply to author
0 new messages