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bug#58558: 29.0.50; re-search-forward is slow in some buffers

From: Lars Ingebrigtsen
Subject: bug#58558: 29.0.50; re-search-forward is slow in some buffers
Date: Sun, 16 Oct 2022 13:01:48 +0200
User-agent: Gnus/5.13 (Gnus v5.13) 
> I just switched between Emacs 28 and Emacs 29 and I do note that
> right after loading Emacs and the Org file, Emacs 29 takes similar time
> with Emacs 28.

Huh, very odd.  Almost as something is...  fragmenting in the buffer?
We do have many caches and stuff -- perhaps something is...  degrading?

I guess some C-level perf measurements would be handy here, but that's
not something I know much about.  Anybody?
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