[wp-trac] [WordPress Trac] #55443: Create WebP sub-sizes and use for output

[WordPress Trac]

#55443: Create WebP sub-sizes and use for output
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 Reporter:  adamsilverstein                      |       Owner:
                                                 |  adamsilverstein
     Type:  enhancement                          |      Status:  assigned
 Priority:  normal                               |   Milestone:  6.0
Component:  Media                                |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests needs-      |     Focuses:
  testing needs-dev-note needs-docs needs-codex  |  performance
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Comment (by markhowellsmead):

 When converting medium-resolution photographs (approx 1600px – 2500px on
 the long edge), WebP files are often larger than the JPEG equivalent. (In
 my tests using my own photography, in around 60% of cases.) This change
 might make the “modern image format” test of Page Speed Insights happy,
 but enforcing WebP by default on sites which use a lot of photography will
 often cause longer image loading times.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55443#comment:14>
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