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: Mitchell <mitchellahren@gmail.com>, 71644@debbugs.gnu.org
> Date: Thu, 20 Jun 2024 13:49:10 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I cannot reproduce this on my system, with the current master branch,
> > i.e. Emacs 30.  I _can_ reproduce this in Emacs 29.3, where indeed
> > expanding any of the two abbrevs takes about 0.5 sec to show on the
> > screen.  But in Emacs 30 it's instantaneous, even though I used an
> > unoptimized build of Emacs 30.  Maybe the reason is that Emacs 30 now
> > uses Org 9.7.4, whereas you have a local installation of 9.6.30?
> 
> What if you add
> (setq org-fold-core-style 'text-properties) to your reproducer?

Then abbrevs don't work (not sure I understand why), so I cannot run
the recipe.