Subject: bug#57079: 29.0.50; Performance of seq-uniq is not very good

From: Eli Zaretskii <[email-masked]>
Date: Tue, 09 Aug 2022 20:18:20 +0300

> From: Lars Ingebrigtsen <[email-masked]>
> Cc: Stefan Kangas <[email-masked]>,  [email-masked]
> Date: Tue, 09 Aug 2022 18:57:33 +0200
> 
> Eli Zaretskii <[email-masked]> writes:
> 
> > What's wrong with using delete-dups for your cases above?
> 
> delete-dups is destructive.  You can copy the list first, of course, but
> seq-uniq should be much faster than it is.

How much faster?  Using copy-sequence and delete-dups is 7 times
faster here than seq-uniq and twice faster than
gnus-delete-duplicates.