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

[Lars Ingebrigtsen]

Ihor Radchenko <yantar92@posteo.net> writes:

> It happens consistently in Emacs 29, but not in all buffers. Sometimes,
> it only happens after some time after Emacs startup. The slowdown is not
> there in Emacs 28.

Is there anything special about buffers where you see these slowdowns?
For instance, a large number of text properties or overlays?

(length (object-intervals (current-buffer)))

will tell you how many text properties there are (sort of), and

(length (overlays-in (point-min) (point-max)))

should tell you the same for overlays.