[wp-trac] [WordPress Trac] #61734: Add the ability to handle "fetchpriority" to ES Modules and Import Maps

[WordPress Trac]

#61734: Add the ability to handle "fetchpriority" to ES Modules and Import Maps
-------------------------------------+-------------------------------------
 Reporter:  dennysdionigi            |       Owner:  westonruter
     Type:  enhancement              |      Status:  accepted
 Priority:  normal                   |   Milestone:  6.8.2
Component:  Script Loader            |     Version:  6.5
 Severity:  minor                    |  Resolution:
 Keywords:  has-patch has-unit-      |     Focuses:  javascript,
  tests                              |  performance
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Comment (by westonruter):

 I published an in-depth post ([https://weston.ruter.net/2025/05/26
 /improve-lcp-by-deprioritizing-interactivity-api-script-modules/ Improve
 LCP by Deprioritizing Script Modules from the Interactivity API]) with
 benchmarking results, showing that adding `fetchpriority=low` to the
 script modules (on both the `script[type=module]` and
 `link[rel=modulepreload]` tags) can [https://weston.ruter.net/2025/05/26
 /improve-lcp-by-deprioritizing-interactivity-api-script-modules
 /#performance-of-low-priority-script-modules improve LCP by ~7%].

 [https://github.com/WordPress/wordpress-develop/pull/8815 Pull request]
 with core patch is ready for review. See also
 [https://github.com/WordPress/gutenberg/pull/70173 corresponding Gutenberg
 PR].

 When combined with moving the script modules to the footer (#63486), the
 LCP improvement can be >9%.

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Ticket URL: <https://core.trac.wordpress.org/ticket/61734#comment:18>
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