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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Is Elisp really that slow?
Date: Thu, 16 May 2019 16:31:23 +0300
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> From: Emanuel Berg <moasenwood@zoho.eu>
> Date: Thu, 16 May 2019 01:02:36 +0200
> 
> > Thus, perhaps "E8 Writing Dynamically-Loaded
> > Modules", where your C functions end up in
> > a separate library, loaded by Emacs at run
> > time, is more interesting.
> 
> Aha, so you can do that! Wonderful!
> 
> Only... I don't find it?
> 
> ;; DNC
> (info "(emacs) Writing Dynamically-Loaded Modules")
> (info "(elisp) Writing Dynamically-Loaded Modules")
> 
> Where is it?

Get a newer Emacs, it's a recent addition to the manual.

> And what is this "E8" notation?

Appendix E, chapter 8.