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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: org-mode freezes sometimes
Date: Tue, 19 Oct 2021 15:20:41 +0300
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 (message from Luca Ferrari on Tue, 19 Oct 2021 11:46:19 +0200)
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> From: Luca Ferrari <fluca1978@gmail.com>
> Date: Tue, 19 Oct 2021 11:46:19 +0200
> 
> I'm running emacs 27.2 with prelude on top of it (if that matters).
> Somehow, when I'm editing an org-mode file with images and code
> blocks, the system works fine for a few minutes, and then it start
> slowing down up to freezing for several seconds. Then it start
> reacting well again, and then turns again slow and freezes, and so on.
> Since the above does not suffice to diagnose the problem, what could I
> start looking at to better inspect the cause of the problem?

If you set garbage-collection-messages to a non-nil value, do you see
messages saying "Garbage collecting..." when Emacs freezes?