[wp-trac] [WordPress Trac] #55052: The tag field hangs the browsers when you have a bunch of tags

[WordPress Trac]

#55052: The tag field hangs the browsers when you have a bunch of tags
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 Reporter:  pikamander2   |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Query         |    Version:  5.9
 Severity:  critical      |   Keywords:
  Focuses:  performance   |
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 One of the recent core updates made the tags feature nearly unusable when
 you have a bunch of tags. We have tens of thousands of tags and it used to
 work fine, but now it freezes after typing the first few letters.

 Other people are reporting the same issue here:
 https://wordpress.org/support/topic/classic-editor-page-freezes-when-tags-
 is-used/

 Steps to reproduce:
 1. Create tens of thousands of tags
 2. Start editing a post
 3. Try typing in the name of a tag
 4. The browser will hang and ask if you want to abort the tab

 It sounds to me like there are two underlying issues here:
 1. The JavaScript is not asynchronous
 2. The JavaScript immediately makes the network request rather than
 waiting a second or two after a letter is typed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55052>
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