Subject: Re: bug#72830: Big rectangular selections are slow

From: Eli Zaretskii <[email-masked]>
Date: Tue, 27 Aug 2024 16:48:54 +0300

> Cc: Stefan Monnier <[email-masked]>, Juri Linkov <[email-masked]>
> From: Mattias Engdegård <[email-masked]>
> Date: Tue, 27 Aug 2024 14:39:37 +0200
> 
> It's a bit surprising (to me) how expensive move-to-column is. The text is all-ASCII without any complications (no long lines, properties, etc).

Does turning off auto-composition-mode help in any way?

Also, since highlighting is AFAIR implemented as overlays, it slows
down check_display_width, which I think would otherwise have moved
very fast if you say there are no properties and no overlays.