[wp-trac] [WordPress Trac] #63858: Trigger the wp_cron action from the shutdown hook instead of the init hook to reduce TTFB (⏱️ Time To First Byte) and improve performance 📈

[WordPress Trac]

#63858: Trigger the wp_cron action from the shutdown hook instead of the init hook
to reduce TTFB (⏱️ Time To First Byte) and improve performance 📈
----------------------------------------------------+---------------------
 Reporter:  pmbaldha                                |       Owner:  (none)
     Type:  enhancement                             |      Status:  new
 Priority:  normal                                  |   Milestone:  6.9
Component:  Cron API                                |     Version:  2.1
 Severity:  normal                                  |  Resolution:
 Keywords:  has-patch needs-testing needs-dev-note  |     Focuses:
----------------------------------------------------+---------------------

Comment (by westonruter):

 @peterwilsoncc OK, so would that mean this change then?


 {{{#!diff
 --- a/src/wp-includes/cron.php
 +++ b/src/wp-includes/cron.php
 @@ -985,17 +985,12 @@ function spawn_cron( $gmt_time = 0 ) {
   * @since 2.1.0
   * @since 5.1.0 Return value added to indicate success or failure.
   * @since 5.7.0 Functionality moved to _wp_cron() to which this becomes a
 wrapper.
 + * @since 6.9.0 The `_wp_cron()` function is moved to the shutdown action
 to prevent the async loopback request from increasing TTFB.
   *
 - * @return false|int|void On success an integer indicating number of
 events spawned (0 indicates no
 - *                        events needed to be spawned), false if spawning
 fails for one or more events or
 - *                        void if the function registered _wp_cron() to
 run on the action.
 + * @return void The function registered _wp_cron() to run on the shutdown
 action.
   */
  function wp_cron() {
 -       if ( did_action( 'wp_loaded' ) ) {
 -               return _wp_cron();
 -       }
 -
 -       add_action( 'wp_loaded', '_wp_cron', 20 );
 +       add_action( 'shutdown', '_wp_cron' );
  }

  /**

 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/63858#comment:8>
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