[wp-trac] [WordPress Trac] #39111: Don't output the adjacent posts rel link by default

[WordPress Trac]

#39111: Don't output the adjacent posts rel link by default
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 Reporter:  johnbillion        |      Owner:
     Type:  enhancement        |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Posts, Post Types  |    Version:
 Severity:  normal             |   Keywords:  needs-patch 2nd-opinion
  Focuses:  performance        |
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 The query performed by `get_adjacent_post()` is an expensive one, and
 quickly becomes a performance bottleneck on sites with a large number of
 posts.

 This function is called twice when viewing a single post in order to
 output the `link rel='prev'` and `link rel='next'` links, and is often one
 of the first things disabled by WordPress-specific hosts in order to
 increase site performance.

 The usefulness of these tags is questionable. In addition, the links don't
 account for paginated posts (using `<!--nextpage-->`) and are therefore
 possibly incorrect in this situation.

 /cc @yoast for SEO review :-)

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Ticket URL: <https://core.trac.wordpress.org/ticket/39111>
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