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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: displaying margins leads to Emacs hanging
Date: Fri, 24 Feb 2023 23:25:11 +0200
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 (message from dalanicolai on Fri, 24 Feb 2023 21:41:59 +0100)
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> From: dalanicolai <dalanicolai@gmail.com>
> Date: Fri, 24 Feb 2023 21:41:59 +0100
> Cc: emacs-devel@gnu.org
> 
> I hope you might have an idea what causes this behavior. And maybe you
> have a suggestion how to prevent it. Furthermore, I guess the behavior might
> be interesting for you to note/observe (but that is just a guess).

I'll try to see if I can find something, but in general if some Lisp
program is very slow, the first thing that's advisable is to profile
it with profiler.el.