[wp-trac] [WordPress Trac] #58773: Improve oEmbed lazy loading

[WordPress Trac]

#58773: Improve oEmbed lazy loading
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 Reporter:  adamsilverstein  |       Owner:  adamsilverstein
     Type:  defect (bug)     |      Status:  assigned
 Priority:  normal           |   Milestone:  6.5
Component:  Embeds           |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:  performance, sustainability
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Comment (by adamsilverstein):

 I started working on this as an experimental modules for the Performance
 Lab plugin in https://github.com/WordPress/performance/pull/886

 This module attempts to optimize oEmbeds using two techniques:

 - For oEmbeds delivered as iframes, ensure the loading=lazy attribute is
 present
 - For oEmbeds built using script tags:
  - move the script src to a data attribute
  - add a page level IntersectionObserver that sets script src before the
 user scrolls to the oEmbed (using a 500px margin)

 The impact of the change would of course depend of which and how many
 oEmbeds a site used, however I think this is worth exploring a bit further

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Ticket URL: <https://core.trac.wordpress.org/ticket/58773#comment:22>
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