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Re: Large source block causes org-mode to be unusable

From: Sébastien Miquel
Subject: Re: Large source block causes org-mode to be unusable
Date: Mon, 21 Jun 2021 18:57:27 +0000

Hi Léo,

Léo Ackermann writes:
I am working in an org-file of reasonable size (<2000 lines): my first paper written in org-mode. Everything fine (and fast) until I started to add `#+BEGIN_proof / #+END_proof` within my .org to make my .pdf export prettier. This caused the editing of the proofs to be very slow: navigation within the proof is fast but adding/removing any char takes around 4s per char. It seems that the fontify function is responsible for that (see screenshot). As far as I understand, this function tries to fontify the whole block as soon as a single char is modified. In my case, it then tries to fontify a whole proof (~4 pages in my .pdf, with many LaTeX formulas) several times per second...
You can try setting org-highlight-latex-and-related to '(latex) instead of

Even with this setting, latex fontification in special blocks is slow. The
reason being that the whole block has the `font-lock-multiline' property, hence
every char insertion triggers refontification of the whole block.

In the function `org-do-latex-and-related', I commented out the second condition
of the `cond' form, which makes calls to `face-at-point'. This yields a
significant speedup, and was enough to make things bearable in my cases. You can
also try to simplify the latex regexp.

If you try these, I'd be interested to hear how much of an improvement theymake.


Sébastien Miquel

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