[wp-trac] [WordPress Trac] #64194: 6.9 Fetch priority can add 10-20 seconds in page load time

[WordPress Trac]

#64194: 6.9 Fetch priority can add 10-20 seconds in page load time
----------------------------+-----------------------------
 Reporter:  ciobanucatalin  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  General         |    Version:  trunk
 Severity:  critical        |   Keywords:
  Focuses:                  |
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 In the https://github.com/WordPress/wordpress-develop/pull/9770 pull
 request it was added a function
 "get_highest_fetchpriority_with_dependents"  [https://github.com/WordPress
 /wordpress-develop/blob/9f3e07c721e3c278c670827d0de2d2de2c61518b/src/wp-
 includes/class-wp-scripts.php#L107].

 This is a recursive function that checks priority and if the check was
 already done it skip it. The problem is with the checked array that is not
 a reference to be the same for all the recursive tree. I encountered a use
 case where this function added to my page load 10-20 seconds, after I
 added the reference the problem was gone

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Ticket URL: <https://core.trac.wordpress.org/ticket/64194>
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