[wp-trac] [WordPress Trac] #58368: WordPress dashboard is very slow when there are many comments (and the database isn't great)

[WordPress Trac]

#58368: WordPress dashboard is very slow when there are many comments (and the
database isn't great)
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 Reporter:  Guss77                    |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  6.3
Component:  Comments                  |     Version:  6.2.2
 Severity:  minor                     |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by FolioVision):

 Replying to [comment:25 spacedmonkey]:
 > I think the biggest issue here is that comment_type does not have an
 index.

 In our testing just adding the index did not always solve the issue of the
 slow Comment Type drop down. It helped on a website with a **dedicated**
 MariaDB database server, but on a **shared** web host we also had to stop
 using `ORDER BY` to improve the performance.

 Full details in our related ticket: #58488

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Ticket URL: <https://core.trac.wordpress.org/ticket/58368#comment:27>
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