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Re: Why is Elisp slow?

From: Stefan Monnier
Subject: Re: Why is Elisp slow?
Date: Tue, 09 Oct 2018 08:27:26 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> elisp is mostly interpreted (contrarily to C which is always compiled to

> native code, so directly executed by the CPU) and very very dynamic
> afaik, not that much optimized at byte-compilation afaiu from what I
> observed, and I guess not that much optimized from the VM point of view…

Emacs's implementation of Elisp is fairly naive and not carefully
optimized.  As a result it's not blazing fast.  This said, on the rare
occasions Elisp was compared to other systems it didn't seem nearly as
slow as I thought.  E.g. I wouldn't be surprised to hear that it's about
as fast as Python (not talking about things like PyPy, tho).


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