bug#7092: 23.1; Dired slow using Emacs remotely

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Sun, 24 Oct 2021 15:08:27 -0700
> Cc: despen@telcordia.com, 7092@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I had the doc string in mind, but we could also add something to
> > PROBLEMS.
> 
> How about this?
> 
> diff --git a/etc/PROBLEMS b/etc/PROBLEMS
> index daff102a0d..e428e27089 100644
> --- a/etc/PROBLEMS
> +++ b/etc/PROBLEMS
> @@ -1654,6 +1654,12 @@ This happens on the proprietary X server
> ASTEC-X when the number of
>  monitors is changed after the server has started.  A workaround is to
>  restart the X server after the monitor configuration has been changed.
> 
> +*** With X forwarding, mouse highlighting can make Emacs slow.
> +If you see slow updates when moving the mouse in an Emacs running on a
> +remote X server, try this:
> +
> +    (setq mouse-highlight nil)
> +

LGTM, thanks.