Ihor Radchenko <yantar92@gmail.com> writes:

> What if you run M-x org-element-cache-reset after exiting the hang?

I did not notice any difference, i.e. still hangs.  However, as seen
below, I see a lot of seemingly *random* behavior, so please that it
with a grain of salt.

> Also, if you can get the export finish, can you also share the
> profiler report? (M-x profiler-report-write-profile from inside the
> profiler report buffer).

All right, I did the following 10 experiments.

********************
*** EXPERIMENT 1 ***
********************

CONFIGURATION:

  (setq-default org-use-extra-keys t)
  
  (setq org-export-use-babel nil
        org-export-with-broken-links 'mark
        org-cite-csl-styles-dir "~/"
        org-cite-export-processors '((t csl)))
        
  (with-eval-after-load 'ox
    (require 'oc-csl))
    
  (setq org-element-use-cache nil
        org-fold-core-style 'overlays)

RESULT:

  HTML exported in 1 minute 46 seconds.

NOTES:

  After the export, 'profiler-report' fails with the error:

    "Assertion failed: (>= match imatch)"

  Hence, I ran 'profiler-stop' and then 'profiler-report'.

  The profile attached to this message as 'export-1.profile'.

********************
*** EXPERIMENT 2 ***
********************

CONFIGURATION:

  Same as Experiment 1.

RESULT:

  HTML exported in 1 minute 56 seconds.

NOTES:

  The same error with the 'profiler-report' repeats.

  Used 'profiler-stop'.
  
  The profile attached to this message as 'export-2.profile'.

************************************
*** EXPERIMENTS 3, 4, 5, 6, 7, 8 ***
************************************

CONFIGURATION:

  (setq-default org-use-extra-keys t)
  
  (setq org-export-use-babel nil
        org-export-with-broken-links 'mark
        org-cite-csl-styles-dir "~/"
        org-cite-export-processors '((t csl)))
        
  (with-eval-after-load 'ox
    (require 'oc-csl))

  ;; This configuration does not include any changes to
  ;; 'org-element-use-cache' or 'org-fold-core-style'.

RESULT:

  Exporting taking forever.

********************
*** EXPERIMENT 9 ***
********************

CONFIGURATION:

  The same as Experiments 3-8.

RESULT:

  Exporting crashes Emacs.

NOTES:

  The OS crash log attached to this message as 'crash.txt'.

*********************
*** EXPERIMENT 10 ***
*********************

CONFIGURATION:

  The same as Experiment 3-8 and 9.

RESULT:

  HTML exported in 1 minute 31 seconds.

NOTES:

  The profile attached to this message as 'export-3-cache.profile'.

Rudy