[wp-trac] [WordPress Trac] #33252: Add a Faster SHORTINIT-like admin-ajax Alternative

[WordPress Trac]

#33252: Add a Faster SHORTINIT-like admin-ajax Alternative
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 Reporter:  bfintal                      |      Owner:
     Type:  feature request              |     Status:  new
 Priority:  normal                       |  Milestone:  Awaiting Review
Component:  General                      |    Version:  4.2.3
 Severity:  normal                       |   Keywords:
  Focuses:  ui, javascript, performance  |
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 The existing `admin-ajax.php` is slow because it loads the whole Core.

 Even though that's useful, this makes `admin-ajax.php` slow to use in
 front-end scenarios where you need fast responses.

 Some code snippets exist that circumvent this by creating their own ajax
 handlers that utilize the SHORTINIT constant. Although these solutions
 would require you to load `wp-load.php` yourself which is not advised.
 E.g. https://coderwall.com/p/of7y2q/faster-ajax-for-wordpress from 2012

 I'd like to propose a feature request for an `admin-ajax.php` likehandler
 that:
 * doesn't load the whole core,
 * loads only some essential functions similar to the functionality given
 by SHORTINIT

 Implementation suggestion: The best way to implement this in my opinion is
 to create 2 new action hooks `wp_ajax_shortinit_{action}` and
 `wp_ajax_shortinit_nopriv_{action}` that behaves identically with
 `wp_ajax_{action}` and `wp_ajax_nopriv_{action}` except that the
 SHORTINIT-like environment is implemented.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33252>
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