[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:  5.9.1
Component:  Query                                |     Version:  5.9
 Severity:  critical                             |  Resolution:
 Keywords:  has-patch needs-testing 2nd-opinion  |     Focuses:
                                                 |  performance
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Comment (by costdev):

 I agree and consider the maintenance fix a necessity for 5.9.1.

 I also agree that matching Gutenberg's behaviour makes sense. The filter,
 whether released in 5.9.1 or 6.0, will allow it to be set to a preferred
 value.

 > @azouamauriac I'm not really sure if limit the result number is a good
 idea, since some result will match but they won't be show up because of
 limit.

 IMO, there is already a technical limit in the form of the feature
 freezing when too many tags exist. This change implements a safety limit
 to prevent that ever occurring.

 There's at least two ways to do this:
 1. Investigate all factors that cause the freeze, from the number of tags,
 to the amount of data (long tag names, etc).
 2. Set a limit that's consistent with other behaviour in Core.

 IMO, setting the limit to `20` makes sense for the following reasons:
 1. Consistency in Core.
 2. The amount of time it takes a user to enter one or two more characters
 to reveal their desired tag is significantly less than scrolling through a
 long list of possible matches.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55052#comment:13>
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