Flyspell causes severe slowdown when manipulating footnotes

Flyspell causes severe slowdown when manipulating footnotes

[arozbiz]

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I just upgraded to Org 9.6 and I've noticed that having flyspell-mode
turned on causes very large slowdowns when adding or deleting footnotes in
an org file with lots of footnotes (e.g., more than 200, which is common
for the academic articles that I use org for). Any ideas for what might be
causing this?

Alan

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Re: Flyspell causes severe slowdown when manipulating footnotes

[Ihor Radchenko]

arozbiz@gmail.com writes:

> I just upgraded to Org 9.6 and I've noticed that having flyspell-mode
> turned on causes very large slowdowns when adding or deleting footnotes in
> an org file with lots of footnotes (e.g., more than 200, which is common
> for the academic articles that I use org for). Any ideas for what might be
> causing this?

Most likely cache updates.
Could you please (1) Set org-element--cache-self-verify to nil and see
if things get back to normal; (2) If things are still slow after setting
the variable, please run M-x profiler-start ... M-x profiler-report and
share the data. See https://orgmode.org/list/87ee2nlslt.fsf@localhost.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell causes severe slowdown when manipulating footnotes

[arozbiz]

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Thanks Ihor for the response. Unfortunately, setting
org-element--cache-self-verify to nil didn't work. Profile report attached.

On Wed, Dec 7, 2022 at 7:23 AM Ihor Radchenko <yantar92@posteo.net> wrote:

> arozbiz@gmail.com writes:
>
> > I just upgraded to Org 9.6 and I've noticed that having flyspell-mode
> > turned on causes very large slowdowns when adding or deleting footnotes
> in
> > an org file with lots of footnotes (e.g., more than 200, which is common
> > for the academic articles that I use org for). Any ideas for what might
> be
> > causing this?
>
> Most likely cache updates.
> Could you please (1) Set org-element--cache-self-verify to nil and see
> if things get back to normal; (2) If things are still slow after setting
> the variable, please run M-x profiler-start ... M-x profiler-report and
> share the data. See https://orgmode.org/list/87ee2nlslt.fsf@localhost.
>
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>
>

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[-- Attachment #2: report.txt --]
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org-element--cache-put org-element--parse-to org-element-at-point org-back-to-heading org-back-to-heading-or-point-min org-get-property-block org--property-local-values] 4 [org-element-footnote-definition-parser org-element--current-element org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil] 77 [org-back-to-heading-or-point-min org-get-property-block org--property-local-values org-entry-get-with-inheritance org-entry-get org-log-into-drawer org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil] 62 [org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil nil] 616 [org-element-section-parser org-element--current-element org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil] 118 [rx--translate-any rx--translate-form rx--translate rx--translate-or rx--translate-form rx--translate rx--translate-seq rx--translate-form rx--translate rx-to-string org-element--parse-generic-emphasis org-element-underline-parser org-element--object-lex org-element-context org--flyspell-object-check-p org-mode-flyspell-verify] 7 [rx--parse-any rx--translate-any rx--translate-form rx--translate rx--translate-or rx--translate-form rx--translate rx--translate-seq rx--translate-form rx--translate rx-to-string org-element--parse-generic-emphasis org-element-underline-parser org-element--object-lex org-element-context org--flyspell-object-check-p] 3 [rx--translate-form rx--translate rx--translate-seq rx--translate-form rx--translate rx-to-string org-element--parse-generic-emphasis org-element-italic-parser org-element--object-lex org-element-context org--flyspell-object-check-p org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil] 3 [flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil nil nil nil nil nil] 38 [org-at-heading-p org-back-to-heading org-back-to-heading-or-point-min org-get-property-block org--property-local-values org-entry-get-with-inheritance org-entry-get org-log-into-drawer org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil] 3 [org-element--cache-put org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil] 10 [org-element-entity-parser org-element--object-lex org-element-context org--flyspell-object-check-p org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil] 6 [org-element-headline-parser org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil] 12 [org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil nil nil] 34 [rx--bracket rx--atomic-regexp rx-to-string org-element-headline-parser org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil] 3 [org-element-paragraph-parser org-element--current-element org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil] 3 [org-get-limited-outline-regexp org-element--current-element org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil] 4 [derived-mode-p org-get-limited-outline-regexp org-element--current-element org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil] 4 [org-element-context org--flyspell-object-check-p org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil nil nil] 24 [rx--translate-group rx--translate-form rx--translate rx--translate-seq rx--translate-form rx--translate rx-to-string org-element--parse-generic-emphasis org-element-italic-parser org-element--object-lex org-element-context org--flyspell-object-check-p org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil] 3 [rx--translate-any rx--translate-form rx--translate "#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_252>" mapcan rx--translate-or rx--translate-form rx--translate rx--translate-seq rx--translate-form rx--translate rx-to-string org-element--parse-generic-emphasis org-element-italic-parser org-element--object-lex org-element-context] 3 [replace-regexp-in-string org-element-headline-parser org-element--parse-to org-element-at-point org-element-at-point-no-context org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil] 4 [org-element-underline-parser org-element--object-lex org-element-context org--flyspell-object-check-p org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil nil nil nil] 3 [org-before-first-heading-p org-back-to-heading-or-point-min org-get-property-block org--property-local-values org-entry-get-with-inheritance org-entry-get org-log-into-drawer org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil] 7 [org-back-to-heading org-back-to-heading-or-point-min org-get-property-block org--property-local-values org-entry-get-with-inheritance org-entry-get org-log-into-drawer org-mode-flyspell-verify flyspell-word flyspell-post-command-hook nil nil nil nil nil nil] 3 [doom-modeline-icon doom-modeline-segment--time eval format-mode-line doom-modeline-format--main eval redisplay_internal\ \(C\ function\) nil nil nil nil nil nil nil nil nil] 3 [org-in-regexp org-in-verbatim-emphasis org-footnote-in-valid-context-p org-footnote-next-reference-or-definition org-activate-footnote-links font-lock-fontify-keywords-region font-lock-default-fontify-region font-lock-fontify-region "#<compiled -0x1562910c9d2d8703>" jit-lock--run-functions jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil] 4 [org-footnote-next-reference-or-definition org-activate-footnote-links font-lock-fontify-keywords-region font-lock-default-fontify-region font-lock-fontify-region "#<compiled -0x156298ff43a83703>" jit-lock--run-functions jit-lock-fontify-now jit-lock-function redisplay_internal\ \(C\ function\) nil nil nil nil nil nil] 3 [yascroll:make-thumb-overlays yascroll:show-scroll-bar-internal yascroll:show-scroll-bar yascroll:safe-show-scroll-bar yascroll:after-window-scroll redisplay_internal\ \(C\ function\) nil nil nil nil nil nil nil nil nil nil] 4 [if let while let let wc-format-modeline-string let wc-generate-modeline let* wc-mode-update setq progn if when "#<lambda 0x1bdc28c2>" apply] 4 [syntax-ppss show-paren--default show-paren-function apply timer-event-handler nil nil nil nil nil nil nil nil nil nil nil] 10 [file-truename file-truename file-truename file-truename file-truename org-roam-descendant-of-p org-roam-file-p org-roam-buffer-p if let azr/tab-bar-tab-name-current tab-bar-tabs tab-bar--current-tab-index doom-modeline-segment--workspace-name eval redisplay_internal\ \(C\ function\)] 3 [counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil nil nil nil nil nil nil] 29 [ivy--reset-state "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil nil nil] 12 ["#<compiled 0x116411fe5fcf76e7>" all-completions ivy--reset-state "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil] 11 [all-completions ivy--reset-state "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil nil] 3 ["#<subr ivy-prescient-sort-function>" sort ivy--reset-state "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil] 20 ["#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil nil nil nil] 8 ["#<compiled 0x13d24e91da08977b>" mapcar easy-menu-get-map easy-menu-add-item easy-menu-change org-install-agenda-files-menu org-mode yankpad--file-elements yankpad--categories yankpad-local-category-to-major-mode run-hooks run-mode-hooks minibuffer-inactive-mode read-from-minibuffer "#<subr ivy-read>" apply] 4 [ivy-rich-format-column "#<compiled -0x1c95333557557b5a>" ivy-rich-format ivy-rich--counsel-M-x-transformer ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil] 12 [read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil nil nil] 67 ["#<compiled 0x1cf6e70892d94720>" cl-delete cl-remove ivy--re-filter ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil] 234 [cl-remove ivy--re-filter ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil] 16 [cl--position cl-position ivy--recompute-index ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil] 4 [documentation ivy-rich-counsel-function-docstring ivy-rich-format-column "#<compiled -0x1c2bf6ae87d1ef89>" ivy-rich-format ivy-rich--counsel-M-x-transformer ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively] 15 ["#<compiled 0x110d11bf6e7e1dc9>" ivy--format-minibuffer-line "#<compiled 0x4d6af82acb26e01>" mapcar ivy--wnd-cands-to-str ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute] 10 [key-chord-lookup-key key-chord-input-method read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil nil nil] 3 [cl-delete cl-remove ivy--re-filter ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil] 20 [ivy-rich-counsel-function-docstring ivy-rich-format-column "#<compiled -0x1c9501fc49641b5a>" ivy-rich-format ivy-rich--counsel-M-x-transformer ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute] 4 [ivy-format-function-default ivy--wnd-cands-to-str ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil] 3 ["#<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_9>" ivy-prescient-re-builder ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil] 3 [ivy--re-filter ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil] 1 ["#<compiled 0x4d6af82acb26e01>" mapcar ivy--wnd-cands-to-str ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil] 3 ["#<compiled 0xe038af2db688220>" prescient-initials-regexp "#<compiled -0xd3a0ee15209d4b3>" mapcar "#<compiled 0xc9c7da72640b9ab>" prescient-filter-regexps ivy-prescient-re-builder ivy-set-text ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively] 4 ["#<compiled -0x1c8ce28d9dc98a33>" substitute-command-keys documentation ivy-rich-counsel-function-docstring ivy-rich-format-column "#<compiled 0xa595a4799184446>" ivy-rich-format ivy-rich--counsel-M-x-transformer ivy--format ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read] 3 ["#<compiled -0x6168eee8b10d129>" cl-remove ivy--re-filter ivy--filter ivy--update-minibuffer ivy--exhibit ivy--queue-exhibit read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil] 2 [easy-menu-get-map easy-menu-add-item easy-menu-change org-install-agenda-files-menu org-mode yankpad--file-elements yankpad--categories yankpad-local-category-to-major-mode run-hooks run-mode-hooks minibuffer-inactive-mode read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x] 5 [yankpad--categories yankpad-local-category-to-major-mode run-hooks run-mode-hooks minibuffer-inactive-mode read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil] 3 [org-element--current-element org-element--parse-elements org-element--parse-elements org-element--parse-elements org-element-parse-buffer yankpad--file-elements yankpad--categories yankpad-local-category-to-major-mode run-hooks run-mode-hooks minibuffer-inactive-mode read-from-minibuffer "#<subr ivy-read>" apply ivy-read counsel-M-x] 3 [funcall-interactively command-execute counsel-M-x-action "#<compiled -0x18f9513b23fbfb80>" ivy-call "#<subr ivy-read>" apply ivy-read counsel-M-x funcall-interactively command-execute nil nil nil nil nil] 7 [Automatic\ GC] 437)) (25489 60701 873247 126000) nil]

Re: Flyspell causes severe slowdown when manipulating footnotes

[Ihor Radchenko]

arozbiz@gmail.com writes:

> Thanks Ihor for the response. Unfortunately, setting
> org-element--cache-self-verify to nil didn't work. Profile report attached.

Thanks!
I just pushed a slight optimization to the footnote sorting code.
Can you try again using the latest main?

https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=169333e1c

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell causes severe slowdown when manipulating footnotes

[Rudolf Adamkovič]

Ihor Radchenko <yantar92@posteo.net> writes:

> I just pushed a slight optimization to the footnote sorting code.

Unrelated to the footnotes mentioned above, but I noticed that Org
starts and kills Ispell all the time.  I see the following messages
repeated over and over when working with Org:

  Starting new Ispell process aspell with american dictionary...done
  ...
  Ispell process killed

For the sake of experiment, I have just tried to export (to HTML) a
subtree that contains nothing in it but a single BibTeX source block.
Sure enough, Org started and killed a new Ispell process!

P.S. I use Flyspell with the following (standard) configuration:

  (add-hook 'after-init-hook
            (lambda ()
              (add-hook 'text-mode-hook #'flyspell-mode)
              (add-hook 'prog-mode-hook #'flyspell-prog-mode)))

Rudy
-- 
"Strange as it may sound, the power of mathematics rests on its evasion
of all unnecessary thought and on its wonderful saving of mental
operations."
-- Ernst Mach, 1838-1916

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Flyspell process called frequently when using Org export (was: Flyspell causes severe slowdown when manipulating footnotes)

[Ihor Radchenko]

Rudolf Adamkovič <salutis@me.com> writes:

> Unrelated to the footnotes mentioned above

Note how I change the email subject to mark a new topic.
In Emacs, it is M-x message-change-subject

> ... , but I noticed that Org
> starts and kills Ispell all the time.  I see the following messages
> repeated over and over when working with Org:
>
>   Starting new Ispell process aspell with american dictionary...done
>   ...
>   Ispell process killed
>
> For the sake of experiment, I have just tried to export (to HTML) a
> subtree that contains nothing in it but a single BibTeX source block.
> Sure enough, Org started and killed a new Ispell process!
>
> P.S. I use Flyspell with the following (standard) configuration:
>
>   (add-hook 'after-init-hook
>             (lambda ()
>               (add-hook 'text-mode-hook #'flyspell-mode)
>               (add-hook 'prog-mode-hook #'flyspell-prog-mode)))

I am unable to reproduce using the latest Org.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell process called frequently when using Org export (was: Flyspell causes severe slowdown when manipulating footnotes)

[Rudolf Adamkovič]

Ihor Radchenko <yantar92@posteo.net> writes:

> Rudolf Adamkovič <salutis@me.com> writes:
>
>> Unrelated to the footnotes mentioned above
>
> Note how I change the email subject to mark a new topic.
> In Emacs, it is M-x message-change-subject

TIL!  Thank you.

> I am unable to reproduce using the latest Org.

I apologize for not providing a sequence of reproduction steps.

Upon further investigation, Org frequently starts and kills the
spellchecker when the document contains `LocalWords' comments.

1. Start Emacs

   emacs -Q

2. Configure Flyspell

   (add-hook 'text-mode-hook #'flyspell-mode)
   (add-hook 'prog-mode-hook #'flyspell-prog-mode)

3. Create a new Org file

   # LocalWords: xyz
   
   Hello there!

4. Export the file to HTML

Expected:

  No Ispell process started on export.

Actual:

  A new Ispell process started on export.

P.S. I also see Org starting Ispell over and over when holding down
`C-v' in a long document that contains lots of scattered `LocalWords'
comments.

Rudy
-- 
"The whole science is nothing more than a refinement of everyday
thinking."
-- Albert Einstein, 1879-1955

Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia

Re: Flyspell causes severe slowdown when manipulating footnotes

[arozbiz]

[-- Attachment #1: Type: text/plain, Size: 1175 bytes --]

Thanks. It definitely helps, but it's still quite slow. What's made the
biggest difference is is advising the relevant functions to turn flyspell
off beforehand and then turn it back on.

```
(defun azr/org-footnote-disable-flyspell (orig-fun &rest args)
  (flyspell-mode -1)
  (apply orig-fun args)
  (flyspell-mode))

(advice-add 'org-footnote-new :around #'azr/org-footnote-disable-flyspell)
(advice-add 'org-footnote-delete :around
#'azr/org-footnote-disable-flyspell)
```

Best,
Alan

On Sat, Dec 10, 2022 at 4:24 AM Ihor Radchenko <yantar92@posteo.net> wrote:

> arozbiz@gmail.com writes:
>
> > Thanks Ihor for the response. Unfortunately, setting
> > org-element--cache-self-verify to nil didn't work. Profile report
> attached.
>
> Thanks!
> I just pushed a slight optimization to the footnote sorting code.
> Can you try again using the latest main?
>
> https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=169333e1c
>
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>
>

[-- Attachment #2: Type: text/html, Size: 2059 bytes --]

Re: Flyspell process called frequently when using Org export (was: Flyspell causes severe slowdown when manipulating footnotes)

[Ihor Radchenko]

Rudolf Adamkovič <salutis@me.com> writes:

> Upon further investigation, Org frequently starts and kills the
> spellchecker when the document contains `LocalWords' comments.
>
> 1. Start Emacs
>
>    emacs -Q
>
> 2. Configure Flyspell
>
>    (add-hook 'text-mode-hook #'flyspell-mode)
>    (add-hook 'prog-mode-hook #'flyspell-prog-mode)
>
> 3. Create a new Org file
>
>    # LocalWords: xyz
>    
>    Hello there!
>
> 4. Export the file to HTML
>
> Expected:
>
>   No Ispell process started on export.
>
> Actual:
>
>   A new Ispell process started on export.

Confirmed.
This is because `org-html-final-function' uses `mhtml-mode' to indent the
resulting html file. `mhtml-mode' unconditionally runs `prog-mode-hook'
thus starting Ispell.

We may try `delay-mode-hooks' around `set-auto-mode', but it is not
honoured by `mhtml-mode'. I guess we can report this as Emacs bug.

> P.S. I also see Org starting Ispell over and over when holding down
> `C-v' in a long document that contains lots of scattered `LocalWords'
> comments.

This sounds like a normal Ispell behaviour.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell causes severe slowdown when manipulating footnotes

[Ihor Radchenko]

arozbiz@gmail.com writes:

> Thanks. It definitely helps, but it's still quite slow. What's made the
> biggest difference is is advising the relevant functions to turn flyspell
> off beforehand and then turn it back on.

Sure, but it is not going to help others.

Could you try to produce the profile using Org 9.5.5 and Org 9.6?
I am wondering if there is anything in Org 9.6 that is slowed compared
to Org 9.5.5.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell causes severe slowdown when manipulating footnotes

[arozbiz]

[-- Attachment #1: Type: text/plain, Size: 978 bytes --]

Happy to. What is the best way to temporarily downgrade to 9.5.5? I install
Emacs through this <https://aur.archlinux.org/packages/emacs-git> Arch AUR
package, which installs the latest version of Org automatically.

Best,
Alan

On Mon, Dec 12, 2022 at 3:32 AM Ihor Radchenko <yantar92@posteo.net> wrote:

> arozbiz@gmail.com writes:
>
> > Thanks. It definitely helps, but it's still quite slow. What's made the
> > biggest difference is is advising the relevant functions to turn flyspell
> > off beforehand and then turn it back on.
>
> Sure, but it is not going to help others.
>
> Could you try to produce the profile using Org 9.5.5 and Org 9.6?
> I am wondering if there is anything in Org 9.6 that is slowed compared
> to Org 9.5.5.
>
> --
> Ihor Radchenko // yantar92,
> Org mode contributor,
> Learn more about Org mode at <https://orgmode.org/>.
> Support Org development at <https://liberapay.com/org-mode>,
> or support my work at <https://liberapay.com/yantar92>
>

[-- Attachment #2: Type: text/html, Size: 1674 bytes --]

Re: Flyspell causes severe slowdown when manipulating footnotes

[Ihor Radchenko]

arozbiz@gmail.com writes:

> Happy to. What is the best way to temporarily downgrade to 9.5.5? I install
> Emacs through this <https://aur.archlinux.org/packages/emacs-git> Arch AUR
> package, which installs the latest version of Org automatically.

If you have Emacs 28, Org 9.5.5 is built-in there.
Or you can git clone Org repo, checkout release_9.5.5, and use it in
front of Emacs load-path when loading Emacs. See
https://orgmode.org/manual/Installation.html

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

Re: Flyspell process called frequently when using Org export (was: Flyspell causes severe slowdown when manipulating footnotes)

[Ihor Radchenko]

Ihor Radchenko <yantar92@posteo.net> writes:

>>   A new Ispell process started on export.
> ...
> Confirmed.
> This is because `org-html-final-function' uses `mhtml-mode' to indent the
> resulting html file. `mhtml-mode' unconditionally runs `prog-mode-hook'
> thus starting Ispell.
>
> We may try `delay-mode-hooks' around `set-auto-mode', but it is not
> honoured by `mhtml-mode'. I guess we can report this as Emacs bug.

Fixed, on main.
The fix will only work in Emacs 30+, because it requires Emacs bug fix
described in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70671
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=e36a4fe20

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>