[wp-trac] [WordPress Trac] #65206: Site Editor: preload initial canvas REST data

[WordPress Trac]

#65206: Site Editor: preload initial canvas REST data
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 Reporter:  extrachill   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Editor       |    Version:  trunk
 Severity:  normal       |   Keywords:  has-patch
  Focuses:  performance  |
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 This ticket tracks the WordPress Core sync/backport for a Gutenberg Site
 Editor preload change.

 The Gutenberg issue/PR are already filed here:

  * https://github.com/WordPress/gutenberg/issues/78074
  * https://github.com/WordPress/gutenberg/pull/78075

 This Core ticket is needed for the corresponding wordpress-develop PR that
 syncs the PHP preload change into {{{src/wp-admin/site-editor.php}}}.

 The Site Editor currently misses several REST API preload paths used
 during the initial editor canvas load, causing avoidable follow-up REST
 requests for individual template part records, Query Loop post
 collections, and public taxonomies.

 Observed late REST routes included:

  * {{{/wp/v2/template-parts/<template-part-id>?context=edit}}}
  *
 {{{/wp/v2/posts?context=edit&offset=0&order=desc&orderby=date&per_page=10&ignore_sticky=false}}}
  *
 {{{/wp/v2/posts?context=edit&offset=0&order=desc&orderby=date&per_page=3&ignore_sticky=false}}}
  * {{{/wp/v2/taxonomies?context=view}}}

 Validation against a Site Editor load benchmark showed the candidate
 reducing measured load time from 1235ms to 914ms (-321ms / -26.0%) and
 eliminating the observed late REST resources (5 -> 0).

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Ticket URL: <https://core.trac.wordpress.org/ticket/65206>
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