>
>
> > I just upgraded to a new version of Linux/emacs/org-mode, and am finding
> > that fill-paragraph (M-q) runs very slowly in org-mode on large files.
> > With about 50k lines in the buffer, fill-paragraph takes around 3 seconds
> > even if the paragraph is only a couple lines.  (The behavior is correct,
> > the problem is just the slowness.)  The time seems to scale linearly with
> > the number of lines in the buffer as if the whole file is being processed
> > during each fill-paragraph.
>
> Actually, the full section is processed. It can be slow on very large
> sections, indeed. Though, you could use a profiler (M-x profiler-start)
> to check if something is suspicious.
>
> Note that Org 8.3+ makes it a lot better with a cache mechanism, but it
> is still buggy at the moment.
>

I see, thanks!  I will insert some section breaks in my file.

- Sean