[wp-trac] [WordPress Trac] #57789: Make theme.json related caches persistent

[WordPress Trac]

#57789: Make theme.json related caches persistent
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 Reporter:  flixos90     |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  6.3
Component:  Themes       |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:  performance
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Comment (by iCaleb):

 One approach could be to mainly just utilize the persistent cache only
 during frontend requests (where it'd get the most performance benefit).

 Each logged-in non-ajax admin requests could, at least once, always fetch
 the theme.json. If there are changes from what is in the persistent cache
 then it can update. As a backup (in case a theme is updated but nobody
 logs in), could also do the same invalidation-checks during cron as well.

 Worst case scenario: no cron is running and no admin-side log-ins are
 occurring. In which case it'd just have to rely on the TTL expiring and a
 frontend would have to do the work to populate the cache again.

 This gives the benefits of persistent cache, while solving for
 invalidation in a pretty reasonable way.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57789#comment:2>
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