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

From: Sebastien Vauban
Subject: Re: [O] long code blocks making Org Mode very slow
Date: Tue, 14 Jul 2015 21:41:07 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (windows-nt)

Angus M <address@hidden> writes:
> I'm trying to run a long Python code block (~4000 lines) in org mode.  The
> code is sandwiched between:
> #+begin_src python
> <python code block>
> #+end_src
> It runs fine, but org mode becomes incredibly slow - when typing text there
> is about a 10 second delay before the character appears on the screen.  If I
> reduce the number of lines of code in the block there is a noticeable
> increase in speed.
> I am not using line numbers, and the delay is not ameliorated by turning off
> fontification.
> If I add a semi-colon before #+begin_src, to comment it off (get rid of src
> environment), then org mode returns to it's normal speed.

The best thing to do, now, is run the profiler:

M-x profiler-start
... type one character (which takes 10 s to be rendered)
M-x profiler-report

Best regards,

Sebastien Vauban

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