bug#71644: 30.0.50; Severe slowdown in larger files with markers beginning in emacs 29+

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: monnier@iro.umontreal.ca, mitchellahren@gmail.com, 71644@debbugs.gnu.org
> Date: Tue, 25 Jun 2024 13:50:21 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > ...  So if you could come up with a change to try on
> > top of Org 9.6 that would change it back to use overlays for folding,
> > we could try that and see if the slowdown goes away, and take it from
> > there.
> 
> (setq org-fold-core-style 'overlays) ; before Org is loaded

Thanks.  Mitchell and Stefan, can you try this?

P.S. For some reason, Stefan's email server rejects my mails "due to
abuse", I hope it could be fixed soon.