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Re: [O] long code blocks making Org Mode very slow

From: Angus M
Subject: Re: [O] long code blocks making Org Mode very slow
Date: Tue, 21 Jul 2015 11:09:39 +0000 (UTC)
User-agent: Loom/3.14 (http://gmane.org/)

> Post a Gist of your file so I can try it out.
> What is you value of `org-src-fontify-natively'?

> Grant Rettke
> --
> gcr <at> wisdomandwonder.com | http://www.wisdomandwonder.com/
> “Wisdom begins in wonder.” --Socrates
> “All creativity is an extended form of a joke.” --Kay
> ((λ (x) (x x)) (λ (x) (x x)))
> “Life has become immeasurably better since I have been forced to stop
> taking it seriously.” --Thompson
> On Wed, Jul 15, 2015 at 7:22 AM, Angus M <anguscmelville <at> gmail.com>
> > I've just discovered that the slow-response is definitely related to font
> > locking.  If I type M-x font-lock-mode to toggle it off then the typing lag
> > problem is solved.
> >
> > According to the Emacs documentation:
> > 'In Emacs 21 and later, turning on font-lock-mode automatically activates
> > the new Just-In-Time fontification provided by jit-lock-mode.'
> >
> > It would appear, therefore, that just-in-time fontification is not taking
> > place in the code block with the whole code block being fontified at once -
> > and hence the delay.
> >
> > Any help to confirm this hypothesis and how to enable just-in-time
> > fontification in the code block would be appreciated.
> >
> > Angus M

Thanks for your help.

Any script of a significant length sandwiched as a snippet in org mode between:
#+begin_src python

causes the slow-down.

For example the (arbitrarily chosen) file argparse.py found at
is 2400 lines long, and causes a lag of about 1 or 2 seconds for a character
to appear on the screen after a key press.

The issue is not to do with running the script, (which I haven't tried with
this example).

My value for org-src-fontify-natively:
(setq org-src-fontify-natively t)

This issue is of less importance to me now as I think it probably makes
sense to run any script of significant length as a stand-alone 'python mode'
file, which I'm now doing - rather than as a snippet in 'org mode'. 
Therefore unless you're curious to solve this problem for its own sake,
please don't invest any significant time on trying to sort it out on my
behalf.  Thanks!

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