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Re: [O] Org mode in combination with emacs follow-mode is terrible

From: Joost Kremers
Subject: Re: [O] Org mode in combination with emacs follow-mode is terrible
Date: Wed, 13 Jun 2018 12:00:00 +0200
User-agent: mu4e 1.1.0; emacs 26.1.50

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.

Joost Kremers
Life has its moments

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