"Christopher M. Miles" <numbchild@gmail.com> writes:

> Emacs often suspend for a long time.
> ...
>         1467  26%                       - org-element--cache-sync
> ...
>         1334  23%                              - catch
>         1332  23%                               - and
>         1332  23%                                - org-indent-add-properties

Thanks for reporting!
It looks like competing catch..throw.  Both org-indent and org-element
are using `interrupt' signals.

Can you try the attached patch and report back?

Best,
Ihor