Subject: bug#66288: 29.1; Performance regression using pipe for subprocess

From: Dmitry Gutov <[email-masked]>
Date: Wed, 4 Oct 2023 00:26:50 +0300

On 03/10/2023 23:58, Gregory Heytings wrote:
> 
>>
>> The usual suspect -- long-line optimizations --
>>
> 
> "Usual suspect"???
> 
> The culprit here is a947c10d90.

If it is indeed the problem change (though I wonder about the exact 
mechanics for the slowdown this noticeable), then instead of outright 
reverting it, I suggest trying out patch 0002 from this set:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=66020#61