[wp-trac] [WordPress Trac] #35454: `lazyload_term_meta` is called many time when calling `get_term_metadata`

[WordPress Trac]

#35454: `lazyload_term_meta` is called many time when calling `get_term_metadata`
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 Reporter:  sfai05        |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  4.4
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:  performance
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Comment (by sfai05):

 Sure. I am running Wordpress 4.4 with Memcached.

 I found out this problem due to super long response time on my admin
 dashboard. And I find that the memcache get request is much higher then
 before ( > 4000 for loading one page ).

 The problem is the function `lazyload_term_meta` is added to hook
 `get_term_metadata` duplicated if you called `WP_Query` for more then one
 time. So when you run `get_term_meta` afterward the action
 `lazyload_term_meta` will trigger multiple time. And in the function
 `lazyload_term_meta` you will do multiple Memcache get depends on how many
 taxonomy you have created.

 I only do ~40 `get_term_meta` it already crashed my memcache server.

 Now I set the flag `update_post_term_cache` to `false` in `WP_Query` to
 keep my server running.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35454#comment:2>
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