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

From: Nick Dokos
Subject: Re: [O] long code blocks making Org Mode very slow
Date: Tue, 14 Jul 2015 17:44:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

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.

That's because a) emacs is single-threaded and b) babel blocks are
executed synchronously. emacs waits for the code block to finish
executing before going on with its business.

See e.g. the thread at


> 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.
> Do I just have to accept that long code blocks can't be entered into Org 
> Mode?  

Now I'm confused: are you executing the code block or aren't you?

IIUC, code blocks can be of arbitrary length: but if you try to run one, you
gotta wait till it finishes. Is that what you are complaining about or
do you see something else?

> Any help would be appreciated.  I am running Org Mode (version 8.2.10) on
> Windows 8.


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