[wp-trac] [WordPress Trac] #59638: Images: repeating a single image causes `fetchpriority` to be repeated

[WordPress Trac]

#59638: Images: repeating a single image causes `fetchpriority` to be repeated
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 Reporter:  adamsilverstein  |       Owner:  (none)
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  6.5
Component:  Media            |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  dev-feedback     |     Focuses:  performance
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Changes (by joemcgill):

 * milestone:  Awaiting Review => 6.5


Comment:

 I'm moving this into the 6.5 milestone for further investigation. This may
 seem unexpected, but was in fact an intentional decision as I understand
 it, so we may end up closing this as a wontfix. For a use case like
 @afercia outlines above, I believe browsers will use the larger image from
 the `srcset` that it already fetched for the subsequent `img` tags rather
 than fetching a smaller file, which is the same behavior that browsers
 will use if it already has a larger that needed file from the source list
 in cache, but worth confirming.

 It would also be worth seeing what the real performance impact of removing
 the optimization would be, since this is likely an edge case optimization
 anyway.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59638#comment:9>
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