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<!-- Automatically generated by conf-create-info-pages -->
[[!toc ]]
Q&A: live
Duration: 35:35
If you have questions and the speaker has not indicated public contact information on this page, please feel free to e-mail us at <emacsconf-submit@gnu.org> and we'll forward your question to the speaker.
# Talk
[[!template id="vid" vidid="mainVideo" src="https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--main.webm" poster="https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--main.png" captions="""<track label="English" kind="captions" srclang="en" src="/2021/captions/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--main.vtt" default />"""
size="97.5M" duration="35:35" other_resources="""[Download .org](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov.org)
[Download .el](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov.el)
[Download --compressed56.webm (57.5MB)](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--compressed56.webm)
[Download --main.vtt](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--main.vtt)
[Download --chapters.vtt](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--chapters.vtt)
[Download --main--chapters.vtt](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--main--chapters.vtt)
[View on Toobnix](https://toobnix.org/w/kJkKrSyfeuhL7Gttgxb572)
"""]]
[[!template id="chapters" vidid="mainVideo" data="""
00:01 Introduction
02:36 Emacs Lisp is a little old
04:19 Benchmark then optimize, not vice versa
05:03 profiler-start
09:31 elp - Emacs Lisp Profiler
13:01 benchmark
19:13 Write less code
20:00 Reduce allocations
22:52 Recent optimizations in Xref
30:52 cl-lib, dash, and seq
"""]]
# Q&A
[[!template id="vid" vidid="qanda" src="https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--answers.webm" poster="https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--answers.png"
size="96.9M" duration="41:29" other_resources="""[Download --answers--compressed32.webm (85.8MB)](https://media.emacsconf.org/2021/emacsconf-2021-faster--optimizing-emacs-lisp-code--dmitry-gutov--answers--compressed32.webm)
"""]]
# Description
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