Thanks Joost,

that's interesting! I never used the profiler but I will try and see how
far I get with it and then come back here.

Gerald.

On Mi, Jun 13 2018, Joost Kremers <joostkrem...@fastmail.fm> wrote:

> On Wed, Jun 13 2018, Eric S Fraga wrote:
>> On Wednesday, 13 Jun 2018 at 09:53, Gerald Wildgruber wrote:
>>> Switching to text-mode, with 5 windows and follow-mode still being
>>> active reduces lag significantly.
>>>
>>> So there must be an issue specifically with the combination of org-mode
>>> and follow-mode!
>>
>> I don't think there's an issue per se in the sense of bugs.  Org does
>> much more processing of the text than does text mode so if you have 60k
>> worth of text to process each time you type something, it's probably not
>> surprising that there is a lag.
>
> Actually, I would suspect it's more of a problem for follow-mode than
> org-mode, because follow-mode needs to keep the different windows in sync.
> For this, it adds a function to `post-command-hook', which means it's run
> after every key press.
>
> It's not inconceivable that `follow-mode' does something that is extra
> time-consuming in an Org buffer. To find out what that might be, you could
> try the Elisp profiler that comes with Emacs. See the section "Profiling"
> in the Elisp manual for details.
>
> Once you've found out which function(s) consume so much time, it might be
> possible to ask in here or on emacs-devel what exactly is causing the
> problem and whether there's a way around it.


--
Dr. Gerald Wildgruber
Institut für Philosophie, Literatur-, Wissenschafts- und Technikgeschichte
Literaturwissenschaft mit Schwerpunkt Literatur und Wissenschaft
Technische Universität Berlin
Straße des 17. Juni 135
D-10623 Berlin
http://www.philosophie.tu-berlin.de/menue/home/
T. +49 (0)30 314 25924
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wildgru...@tu-berlin.de
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