[wp-trac] [WordPress Trac] #12009: Add support for HTML 5 "async" and "defer" attributes

[WordPress Trac]

#12009: Add support for HTML 5 "async" and "defer" attributes
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 Reporter:  Otto42                         |       Owner:  joemcgill
     Type:  enhancement                    |      Status:  closed
 Priority:  high                           |   Milestone:  6.3
Component:  Script Loader                  |     Version:  4.6
 Severity:  normal                         |  Resolution:  fixed
 Keywords:  has-patch commit has-dev-note  |     Focuses:  performance
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Comment (by westonruter):

 In [changeset:"61176" 61176]:
 {{{
 #!CommitTicketReference repository="" revision="61176"
 Script Loader: Guard against exponential recursion during calculation of
 loading strategy and fetchpriority.

 This addresses a performance issue in the recursive
 `WP_Scripts::get_highest_fetchpriority_with_dependents()` and
 `WP_Scripts::filter_eligible_strategies()` methods for redundant
 processing of shared dependencies in complex dependency graphs. To fix
 this, a `$stored_results` param is introduced which is passed by
 reference; this variable contains a cache of the calculated results for
 all scripts handles, so that subsequent calls for the same handle can
 return the cached value instead of re-computing it.

 Developed in https://github.com/WordPress/wordpress-develop/pull/10459

 Follow-up to [60704], [60931], [56033].

 Props ciobanucatalin, b1ink0, westonruter, mukesh27.
 See #61734, #12009.
 Fixes #64194.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/12009#comment:169>
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