[wp-trac] [WordPress Trac] #34395: Don't load admin files on each request

[WordPress Trac]

#34395: Don't load admin files on each request
--------------------------+-----------------------------
 Reporter:  dimadin       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:  performance   |
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 In `wp-settings.php`, where WordPress is actually started, we load `wp-
 includes/rest-api.php` which loads `wp-includes/rest-api/class-wp-rest-
 server.php` which loads `wp-admin/includes/admin.php` which then loads a
 bunch of admin files and translation.

 This is wrong for two reasons:

  * We shouldn't load admin files on each request.
  * It is against #33413.

 I don't see why admin files are needed in `WP_REST_Server` though they
 might be needed by REST API. In that case, it should be lazy loaded
 somewhere.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34395>
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