Hello,

On Thu 03 Oct 2024 at 06:16pm +03, Eli Zaretskii wrote:

>> From: Sean Whitton <spwhitton@spwhitton.name>
>> Cc: 72826@debbugs.gnu.org, Juri Linkov <juri@linkov.net>, João Távora
>>  <joaotavora@gmail.com>
>> Date: Thu, 03 Oct 2024 22:28:49 +0800
>>
>>        38958  93% - icomplete-post-command-hook
>>        38958  93%  - icomplete-exhibit
>>        38819  93%   - icomplete-completions
>>        38749  92%      string-width
>>           43   0%    + icomplete--sorted-completions
>>           27   0%      buffer-string
>>          139   0%   + sit-for
>>
>> I think the culprit is probably the evaulation of
>> (string-width (buffer-string)) in icomplete-completions.
>
> Does it help to disable auto-composition-mode?

It looks like that slightly improves the situation, but does not fix it.
It's still extremely slow.

I think I have a fix, which I've attached.  I'll test it locally for a
couple of days before installing it.

-- 
Sean Whitton