path: root/2021/info/faster-schedule.md

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Q&A: live  
Duration: 35:35  


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# Talk

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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

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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)  
"""]]
[[!template id="chapters" vidid="qanda" data="""
00:00 Why are overlays slow compared to text properties?
03:21 Would these optimizations be helpful in a personal init.el?
04:28 What's a good approach for benchmarking destructive operations?
06:06 Do you recommend avoiding cl-defstruct in favour of "pure" lists/vectors?
08:20 Possible to optimize Emacs packages with code compiled from other languages?
10:26 (Q&A logistics)
12:25 What about text properties vs. buffer-local variables to store position cache?
18:40 Followup on earlier cl-defstruct benchmark discussion RE: AVL trees
30:48 Does cl-defstruct have memory overhead/general memory usage discussion
"""]]


# Description