[wp-trac] [WordPress Trac] #16894: Bulk load Comment Meta upon access

[WordPress Trac]

#16894: Bulk load Comment Meta upon access
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 Reporter:  dd32                   |       Owner:  boonebgorges
     Type:  defect (bug)           |      Status:  assigned
 Priority:  normal                 |   Milestone:  4.4
Component:  Comments               |     Version:  3.1
 Severity:  normal                 |  Resolution:
 Keywords:  has-patch 2nd-opinion  |     Focuses:  performance
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Comment (by boonebgorges):

 [34268] turns on commentmeta priming by default. For the purposes of
 viewing comments on a single page, via `comments_template()` - which is
 the most common use of comments, and is the most likely to cause
 performance concerns - I'm going to introduce lazy-loading.

 A note that I'm not going to set a `$wp_query` flag. `update_meta_cache()`
 should be idempotent for the same set of comment IDs; the function bails
 early if all objects have already had their metadata loaded into cache. If
 we find that calling `update_meta_cache()` more times than strictly
 necessary is causing real-life performance issues, let's introduce a
 `comment_meta_updated` flag or something like that.

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Ticket URL: <https://core.trac.wordpress.org/ticket/16894#comment:27>
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