[wp-trac] [WordPress Trac] #59301: Incorporate script loading strategies in WP Admin to improve performance where applicable

[WordPress Trac]

#59301: Incorporate script loading strategies in WP Admin to improve performance
where applicable
-------------------------------------+----------------------------
 Reporter:  westonruter              |      Owner:  (none)
     Type:  enhancement              |     Status:  new
 Priority:  normal                   |  Milestone:  Future Release
Component:  Administration           |    Version:  6.3
 Severity:  normal                   |   Keywords:
  Focuses:  javascript, performance  |
-------------------------------------+----------------------------
 As of #12009 the script loader now has the ability for scripts to be
 printed with `async` or `defer`. This is being used on the frontend now
 for block view scripts (#59115), the `comment-reply` script (#58870), and
 the `wp-embed` script (#58931). Nevertheless, these new script loading
 strategies are not currently being used in the admin. There may be
 opportunities to improve performance by doing so.

 Typically only `jquery-core`, `jquery-migrate`, and `utils` (less
 frequently `moxiejs` and `plupload`, and even less frequently `wp-
 polyfill-inert`, `regenerator-runtime`, `wp-polyfill`, `wp-hooks`,
 `zxcvbn-async`, `wp-codemirror`, and `underscore`) are loaded in the
 `head` in the admin; furthermore, these scripts are concatenated together
 via `load-scripts.php`. For backwards-compatibility, these scripts might
 not be able to be delayed or moved to the footer. In other cases, there
 may be existing footer scripts that could be moved to the `head` and made
 to load with `defer`: this would ensure that they start loading sooner so
 that they can execute as soon as the document finishes loading. Other
 scripts could potentially be lazy-loaded only when needed (e.g. `zxcvbn`).

 Note that the block/site editor screens will benefit the most from
 [https://github.com/WordPress/gutenberg/discussions/53260#discussioncomment-6870404
 block lazy loading].

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Ticket URL: <https://core.trac.wordpress.org/ticket/59301>
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