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

[Eli Zaretskii]

> Date: Tue, 03 Oct 2023 20:58:17 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Dmitry Gutov <dmitry@gutov.dev>, gerd.moellmann@gmail.com, 
>     66288@debbugs.gnu.org, cph@chris-hanson.org
> 
> > The usual suspect -- long-line optimizations --
> >
> 
> "Usual suspect"???

What other significant changes in redisplay, with a potential effect
on performance, were made in Emacs 29?

> The culprit here is a947c10d90.

Thanks.