[wp-trac] [WordPress Trac] #35293: Emoji Regex in wp_encode_emoji() is wildly inaccurate

[WordPress Trac]

#35293: Emoji Regex in wp_encode_emoji() is wildly inaccurate
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 Reporter:  pento         |       Owner:  pento
     Type:  defect (bug)  |      Status:  reopened
 Priority:  normal        |   Milestone:  4.9
Component:  Emoji         |     Version:  4.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by pento):

 == TEST 4

 Regexen are clearly slow, and there are 2661 emoji in the Twemoji library.
 Let's try putting it in an array, and `str_replace()` with each element in
 said array.

 '''Data''': https://travis-ci.org/pento/test-41501/jobs/260153544

 Analysis:
 - For PHP 5.4-5.6, this faster than the baseline for every test except
 short posts, where time is up from <10ms, to ~30ms.
 - For Long and Super Long posts, the difference is dramatic - down from
 500ms to 40ms, and 4600ms to 100ms, respectively.
 - For PHP 7.0+, the difference is similar, but less dramatic - the
 baseline was already usably fast.
 - Compared to Old, there's still some work to do - there are several cases
 where Old processes in <5 ms, where New takes 30+ms. For longer posts,
 however, New is faster.

 Conclusion: Test 4 is worth attempting to optimise further.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35293#comment:30>
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