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Changes between Initial Version and Version 3 of Ticket #58069

Ticket #58069
- Property Keywords has-patch has-unit-tests added
- Property Component changed from Editor to Script Loader

-                      initial
+                      v3
 The `_wp_normalize_relative_css_links()` function is not currently implemented in an optimal way. It is doing a regex match for all instances of `url(...)` in a given CSS, and then for each match it checks if it is a relative URL. If so, it then makes the URL absolute and then does ''another'' global search & replace in the CSS to replace the relative path with the absolute path. This means for every search there is a secondary search. This secondary `str_replace()` can be eliminated by replacing the unitial `preg_match_all()` with a `preg_replace_callback()`. This makes the function run >2x faster when [https://gist.github.com/westonruter/7f916bee3f45ef9307235daefb603e7c benchmarked] being run across each CSS file in Gutenberg and the built-in themes.
+Essentially the function can be turned from O(n²) to O(n).
 …
 > phpbench run Bench.php --report=default '--iterations=10' '--revs=500'
 PHPBench (1.2.10) running benchmarks... #standwithukraine
 with PHP version 7.4.33, xdebug ❌, opcache ❌
+with PHP version 7.4.33, xdebug , opcache
 \Bench