[wp-trac] [WordPress Trac] #33210: Add a preconnect header along with emoji settings JS

[WordPress Trac]

#33210: Add a preconnect header along with emoji settings JS
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 Reporter:  pento        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Future Release
Component:  General      |    Version:  4.2
 Severity:  normal       |   Keywords:  emoji
  Focuses:  performance  |
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 Adding this to the header along with the `_wpemojiSettings` script would
 tell browsers that support it (currently Chromium trunk and Firefox) to
 pre-connect to the CDN, getting DNS lookup and SSL negotiation out of the
 before it's actually needed.

 On my connection, this was ~90ms, which would be saved on the time from
 `DOMContentLoaded` to the first emoji render.

 `<link rel="preconnect" href="https://s.w.org">`

 https://w3c.github.io/resource-hints/#preconnect

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Ticket URL: <https://core.trac.wordpress.org/ticket/33210>
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