[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:
----------------------------------------------------+---------------------
Changes (by peterwilsoncc):

 * keywords:  has-patch needs-testing => has-patch needs-testing needs-dev-
     note


Comment:

 @westonruter I've been considering this and think it could be worth trying
 if committed prior to the first beta release. It would be good to have a
 dev note published around the same time with a call out for testing.

 Currently, the cron loopback request fires on the `wp_loaded` hook in the
 function `_wp_cron()`. `wp_cron` fires on the `init` hook and registers
 the loopback request to fire later. [https://github.com/WordPress
 /wordpress-develop/blob/ab52706cb23c11a5e784219420c779a55a474c0b/src/wp-
 includes/cron.php#L993-L999 See the source code].

 The wrapper function was added in WordPress 5.7.0 to maintain backward
 compatibility for plugins running `remove_action( 'init', 'wp_cron' )`.

 In this case, I think changing the hook used in `wp_cron` is adequate.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/63858#comment:7>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform