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From: Philipp Stephani <p.stephani2@gmail.com>
To: Emacs developers <emacs-devel@gnu.org>
Subject: Why is lexical binding so slow?
Date: Sun, 02 Jul 2017 18:15:20 +0000	[thread overview]
Message-ID: <CAArVCkScvmjtrBovGRZWthp8JjxOD1_C+NSSY-E5jNPKJxhTJw@mail.gmail.com> (raw)

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Hi,

the manual states (
https://www.gnu.org/software/emacs/manual/html_node/elisp/Lexical-Binding.html
):
"Lexical binding opens up many more opportunities for optimization, so
programs using it are likely to run faster in future Emacs versions."
However, in practice, at least some libraries are significantly slower with
lexical binding, cf.
https://github.com/mooz/js2-mode/issues/426#issuecomment-312506855.
Why is that? Shouldn't code compiled with lexical binding be at least as
fast as code compiled with dynamic binding?

Philipp

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             reply	other threads:[~2017-07-02 18:15 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-02 18:15 Philipp Stephani [this message]
2017-07-02 18:36 ` Why is lexical binding so slow? Stefan Monnier
2017-12-25 21:20   ` Philipp Stephani
2017-12-26  4:49     ` Eli Zaretskii

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