[wp-trac] [WordPress Trac] #31746: get_blogs_of_user() can be very slow when a user is a member of thousands of sites

[WordPress Trac]

#31746: get_blogs_of_user() can be very slow when a user is a member of thousands
of sites
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 Reporter:  jtsternberg   |       Owner:  johnbillion
     Type:  defect (bug)  |      Status:  reviewing
 Priority:  normal        |   Milestone:  Future Release
Component:  Users         |     Version:  3.0
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:  multisite
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Comment (by boonebgorges):

 > What should/would trigger cache invalidation?

 Blog membership is determined by caps, which is stored in
 `wp_x_capabilities` in usermeta. Invalidation could happen at a low-level,
 in `WP_User->add_role()` `set_role()` `remove_role()` etc, or even by
 intercepting `update_option()` calls if we really wanted to cover all
 possible points.

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Ticket URL: <https://core.trac.wordpress.org/ticket/31746#comment:16>
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