[wp-trac] [WordPress Trac] #37387: Resource hinting: Do not preconnect to emoji CDN.

[WordPress Trac]

#37387: Resource hinting: Do not preconnect to emoji CDN.
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 Reporter:  peterwilsoncc                        |       Owner:
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  4.6
Component:  Script Loader                        |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  needs-patch needs-unit-tests good-   |     Focuses:
  first-bug                                      |
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Comment (by pento):

 Let's change it to a `dns-prefetch`, which will still give us some
 advantage.

 * As has been discussed, the `preconnect` will be potentially pretty heavy
 on the CDN. With the Unicode 9.0 emoji update, almost all browsers will
 trigger the `preconnect`, even if we wait until after they've failed the
 emoji render test. This will reduce over time, as browsers add native
 Unicode 9.0 support.
 * The `preconnect` only opens one connection, but `s.w.org` is HTTP/1.1,
 so the browser will use the preconnected connection for the first emoji,
 then it has to open new connections for subsequent emoji. That seems...
 not very helpful. :-)

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Ticket URL: <https://core.trac.wordpress.org/ticket/37387#comment:9>
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