[wp-trac] [WordPress Trac] #46190: Firefox Emoji Detection Slow

[WordPress Trac]

#46190: Firefox Emoji Detection Slow
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 Reporter:  superpoincare  |       Owner:  (none)
     Type:  enhancement    |      Status:  new
 Priority:  normal         |   Milestone:  Awaiting Review
Component:  Emoji          |     Version:  5.0.3
 Severity:  normal         |  Resolution:
 Keywords:                 |     Focuses:
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Comment (by pento):

 This is kind of weird. I can reproduce some slowdown (~100ms in my tests)
 in Firefox on Windows when I first load the site in a new tab, but it's
 fast after that.

 Unfortunately, the Firefox performance measurement tools aren't so good
 for drilling down into what's going on, so I kind of have to guess based
 on logging lots of timing statements.

 The best guess I have is that `toDataURL()` seems to block on network
 issues: I'm able to make it more extreme by throttling the network
 connection. This isn't particularly reliable, though.

 It's also worth noting that this method of timing has its own issues:
 adding a time check before `window._wpemojiSettings` is printed will often
 show a 70ms+ delay for no apparent reason.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46190#comment:1>
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