Implement passive listeners in jQuery to improve scrolling performance

Created on 2 August 2022, almost 2 years ago
Updated 11 January 2024, 6 months ago

Problem/Motivation

When running web.dev or Lighthouse on my Drupal 9 site, I get the following:

Does not use passive listeners to improve scrolling performance

The file is core/assets/vendor/jquery/jquery.min.js

Jquery 4 is looking at passive listeners: https://github.com/jquery/jquery/issues/2871

Great article:
https://screpy.com/passive-event-listeners/

Steps to reproduce

Run page speed/lighthouse on a page containing jQuery

Proposed resolution

Add a fix/shim JS file that makes required evnt listeners passive when possible, see https://stackoverflow.com/a/62177358

Remaining tasks

Review the patch

User interface changes

None

API changes

?

Data model changes

None

Release notes snippet

?

✨ Feature request
Status

Needs work

Version

11.0 πŸ”₯

Component
JavascriptΒ  β†’

Last updated about 15 hours ago

Created by

πŸ‡ΊπŸ‡ΈUnited States SocialNicheGuru

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  • Needs tests

    The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.

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