[wp-trac] [WordPress Trac] #56990: Render blocking CSS `classic-themes.css` unnecessarily enqueued

[WordPress Trac]

#56990: Render blocking CSS `classic-themes.css` unnecessarily enqueued
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 Reporter:  adamsilverstein          |       Owner:  flixos90
     Type:  defect (bug)             |      Status:  assigned
 Priority:  normal                   |   Milestone:  6.2
Component:  Themes                   |     Version:  6.1
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |     Focuses:  css, performance
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Comment (by scruffian):

 I spent some more time thinking about this. Here are the options as I see
 them:
 1. We use an external file and only load it for themes that need it. This
 has the advantage of being cached, so although it will require extra bytes
 on the first load, subsequent loads will be much faster.
 2. We inline the styles. This might result in a performance improvement
 the first time because it eliminates a network request, but these rules
 will need to be loaded on every subsequent load, so I believe the overall
 impact will be greater.

 I put together a PR with a different approach, but I don't think it's any
 better:
 https://github.com/WordPress/wordpress-develop/pull/4022

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Ticket URL: <https://core.trac.wordpress.org/ticket/56990#comment:37>
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