[wp-trac] [WordPress Trac] #34359: Cache output of `wp_upload_dir()` to improve performance

[WordPress Trac]

#34359: Cache output of `wp_upload_dir()` to improve performance
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 Reporter:  mikeschroder                   |       Owner:  mikeschroder
     Type:  defect (bug)                   |      Status:  assigned
 Priority:  normal                         |   Milestone:  4.5
Component:  Media                          |     Version:
 Severity:  normal                         |  Resolution:
 Keywords:  needs-testing has-patch early  |     Focuses:  multisite,
                                           |  performance
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Comment (by azaozz):

 Replying to [comment:25 mikeschroder]:

 Was thinking more about avoiding the `wp_mkdir_p()` call on (very) busy
 sites with persistent cache. That seems to be the slowest part of
 `wp_upload_dir()` and is needed only once a month when uploading a file.

 We have to keep calling it so we are 100% backwards compatible. If a theme
 uses `wp_upload_dir()` on the front end on a busy site, it is called many
 thousands of times every day for no good reason :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/34359#comment:26>
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