[wp-trac] [WordPress Trac] #59178: Performance optimization of wp_get_block_css_selector()

[WordPress Trac]

#59178: Performance optimization of wp_get_block_css_selector()
-------------------------+-------------------------------------------------
 Reporter:  mukesh27     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Editor       |    Version:  6.3
 Severity:  normal       |   Keywords:  needs-patch has-screenshots good-
  Focuses:  performance  |  first-bug
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 On the TT3 home page, a single post with content (including an image and
 text) is causing calls to the `wp_get_block_css_selector` function during
 testing. This function call occurs 567 times, which is significantly
 impacting performance. A deeper analysis reveals that the `array_merge`
 function is being called 372 times within the `wp_get_block_css_selector`
 function, leading to unnecessary overhead.

 According to measurements taken using the XHProf tool, these activities
 are consuming approximately 2% of the total load time for the page.
 Addressing this issue has the potential to not only enhance performance
 but also contribute to improved memory management, as demonstrated in the
 attached screenshot.

 Additional props to @joemcgill for helping to identify the bug!

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Ticket URL: <https://core.trac.wordpress.org/ticket/59178>
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