Subject: bug#50877: 28.0.50; Gnus: nnimap backend is extremely slow to initialise new groups

From: Stefan Kangas <[email-masked]>
Date: Wed, 29 Sep 2021 02:11:14 -0700

Lars Ingebrigtsen <[email-masked]> writes:

>> I'm cc'ing Lars and Stefan Kangas, who are the most "involved" here. The
>> benchmarks are gruesome:
>
> Yeah, sounds like that commit has to be reverted.

Agreed.  We should also add a comment about why we shouldn't use
`seq-difference' here.