Measure the impact of native image lazy loading on desktop
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	• Gilles
	Aug 21 2019, 8:38 AM

Description

This should be straightforward to implement, at least for regular article thumbnails. We should ensure that the attribute doesn't show up Mobile Frontend, in order to avoid any potential conflicts with its JS-based image lazy loading.

The expected impact is likely to be big on our large articles: https://twitter.com/TheRealNooshu/status/1163827485076799489

This will be tested on eswiki and ruwiki for a week, to see the impact on RUM metrics and on perceived performance survey responses.

Acceptance criteria

Ensure that the mobile site's lazy loaded solution still works as intended when enabling this flag

Details

	Subject	Repo	Branch	Lines +/-
	Add support for native image lazy loading	mediawiki/core	master	+15 -1
	Ensure native image lazy loading is desktop-only	mediawiki/extensions/MobileFrontend	master	+5 -0

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Related Objects
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Status	Assigned	Task
Open	None	T158181 Aim for workflow equivalence for MediaWiki on desktop and mobile web
Open	None	T148047 Desktop MediaWiki should be able to lazy load images
Resolved	TheDJ	T230897 Measure the impact of native image lazy loading on desktop

Event Timeline

• Gilles triaged this task as High priority.Aug 21 2019, 8:38 AM

• Gilles created this task.

• Gilles updated the task description. (Show Details)

Change 531440 had a related patch set uploaded (by Gilles; owner: Gilles):
[mediawiki/extensions/MobileFrontend@master] Ensure native image lazy loading is desktop-only

https://gerrit.wikimedia.org/r/531440

Change 531442 had a related patch set uploaded (by Gilles; owner: Gilles):
[mediawiki/core@master] Add support for native image lazy loading

https://gerrit.wikimedia.org/r/531442

• mobrovac added a project: Platform Team Workboards (Clinic Duty Team).Aug 21 2019, 9:27 AM

• mobrovac moved this task from Inbox to External Code Review Needed on the Platform Team Workboards (Clinic Duty Team) board.

Change 531440 merged by jenkins-bot:
[mediawiki/extensions/MobileFrontend@master] Ensure native image lazy loading is desktop-only

https://gerrit.wikimedia.org/r/531440

ReleaseTaggerBot added a project: MW-1.34-notes (1.34.0-wmf.20; 2019-08-27).Aug 21 2019, 6:00 PM

Change 531442 merged by jenkins-bot:
[mediawiki/core@master] Add support for native image lazy loading

https://gerrit.wikimedia.org/r/531442

Maintenance_bot removed a project: Patch-For-Review.Aug 22 2019, 2:10 AM

I will enable this for a short period on eswiki and ruwiki to measure the impact. But the unresolved issues around printing, especially considering how prominently we advertise printing in the sidebar, makes this new browser feature somewhat impractical for now.

• Gilles renamed this task from Enable native image lazy loading on desktop to Measure the impact of native image lazy loading on desktop.Aug 23 2019, 1:26 PM

• Gilles updated the task description. (Show Details)

• Gilles lowered the priority of this task from High to Medium.Aug 23 2019, 1:30 PM

Krinkle awarded a token.Aug 23 2019, 2:12 PM

• kchapman moved this task from Inbox, needs triage to Doing (old) on the Performance-Team board.Aug 26 2019, 8:21 PM

Anomie moved this task from External Code Review Needed to Done on the Platform Team Workboards (Clinic Duty Team) board.Sep 3 2019, 3:04 PM

• Gilles mentioned this in T148047: Desktop MediaWiki should be able to lazy load images.Sep 29 2019, 2:15 AM

Lens0021 subscribed.Dec 21 2019, 7:12 AM

• Gilles lowered the priority of this task from Medium to Lowest.Jan 6 2020, 1:17 PM

I think this would be super interesting to do: we could measure the difference in carbon footprint using the https://www.thegreenwebfoundation.org API/data.

• Gilles moved this task from Doing (old) to Backlog: Maintenance, non-prioritized on the Performance-Team board.Apr 20 2020, 12:00 PM

Marking as Resolved as it is in the Done column. Feel free to reopen if there is remaining work.

So what was the impact?

Krinkle reopened this task as Open.Oct 8 2022, 6:03 AM

Aklapper removed • Gilles as the assignee of this task.Oct 10 2022, 10:01 AM

Izno subscribed.Oct 13 2022, 11:57 PM

Aklapper added a project: MediaWiki-General.Oct 16 2022, 4:31 PM

Universal_Omega subscribed.Nov 3 2022, 10:10 PM

What's the status of this? I can't find any evidence in mediawiki-config that this was ever turned on in production, but apparently fandom is considering using it?

cscott mentioned this in T324158: Supporting NativeImageLazyLoading in Parsoid.Nov 30 2022, 9:51 PM

Krinkle mentioned this in T230812: Use native image lazy loading on mobile site.Jan 23 2023, 4:01 PM

• nray subscribed.Feb 16 2023, 11:36 PM

• nray updated the task description. (Show Details)Feb 18 2023, 1:24 AM

I think this should be closed. Indications are that it was either done very shortly or not at all. When the other tasks for lazy loading move forward, an evaluation can be reconsidered.

TheDJ closed this task as Resolved.Feb 20 2023, 10:05 AM

TheDJ claimed this task.

Measure the impact of native image lazy loading on desktopClosed, ResolvedPublicActions