[wp-trac] [WordPress Trac] #43258: Output buffer template rendering and add filter for post-processing (e.g. caching, optimization)

[WordPress Trac]

#43258: Output buffer template rendering and add filter for post-processing (e.g.
caching, optimization)
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 Reporter:  nextendweb                           |       Owner:
                                                 |  westonruter
     Type:  enhancement                          |      Status:  closed
 Priority:  normal                               |   Milestone:  6.9
Component:  General                              |     Version:
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests dev-        |     Focuses:  docs,
  feedback needs-dev-note                        |  performance
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Comment (by westonruter):

 In [changeset:"61008" 61008]:
 {{{
 #!CommitTicketReference repository="" revision="61008"
 Script Loader: Load block styles on demand in classic themes via the
 template enhancement output buffer.

 * This applies in classic themes when a site has not opted out of the
 template enhancement buffer by filtering
 `wp_should_output_buffer_template_for_enhancement` off.
 * Both `should_load_separate_core_block_assets` and
 `should_load_block_assets_on_demand` are filtered on, as otherwise they
 are only enabled by default in block themes.
 * Any style enqueued after `wp_head` and printed via `print_late_styles()`
 will get hoisted up to be inserted right after the `wp-block-library`
 inline style in the `HEAD`.
 * The result is a >10% benchmarked improvement in LCP for core classic
 themes due to a ~100KB reduction in the amount of CSS unconditionally
 being served with every page load.

 Developed in https://github.com/WordPress/wordpress-develop/pull/10288

 Follow-up to [60936].

 Props sjapaget, westonruter, peterwilsoncc, dmsnell, mindctrl.
 See #43258.
 Fixes #64099.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/43258#comment:83>
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