bug#15876: 24.3.50; Highly degraded performance between rev 114715 and 115006

[Eli Zaretskii]

> From: "Sebastien Vauban" <sva-news@mygooglest.com>
> Date: Wed, 13 Nov 2013 15:04:06 +0100
> Cc: 15876@debbugs.gnu.org
> 
> - Moving with C-up/down takes more time with latest Emacs, and uses up to 33%
>   of my CPU (vs about 1% with rev 114715).
> 
> - S-TAB'ing in an Org mode file takes 20s (vs 1s with rev 114715) and eats up
>   to 33% of my CPU as well.

Try setting cache-long-scans to nil in your Org buffers, and see if
that makes any change.  If it does, then please report as a bug with
some minimal reproduction recipe starting with "emacs -Q".