this post was submitted on 30 Oct 2023
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Share how did you make Emacs faster. (alien.top)
submitted 10 months ago by [email protected] to c/[email protected]
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I've been looking for methods to improve Emacs performance especially with my configuration being over >3k. I'm not particularly interested in startup-time since I never close Emacs. Here's what I found so far

(setq package-native-compile                            t
      gcmh-high-cons-threshold                          100000000
      gc-cons-threshold                                 100000000
      scroll-conservatively                             101
      jit-lock-defer-time                               0
      large-file-warning-threshold                      nil)



(add-hook 'after-init-hook #'(lambda () (setq gc-cons-threshold (* 100 1000 1000))))
(defvar gc-timer nil)
(defun salih/maybe-gc ()
  (let ((original gc-cons-threshold))
    (setq gc-cons-threshold 800000)
    (setq gc-cons-threshold original
          gc-timer (run-with-timer 2 nil #'salih/schedule-maybe-gc))))

(defun salih/schedule-maybe-gc ()
  (setq gc-timer (run-with-idle-timer 2 nil #'salih/maybe-gc)))

(salih/schedule-maybe-gc)

I can tell that I've noticed some improvements.

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[–] [email protected] 1 points 10 months ago (2 children)

  1. use a POSIX OS (i.e., linux, unix, or macOS) as their file system and I/O management are generally more performant than Windows. NOTE: macOS I/O is worse than linux/unix, but better than windows; and their ARM chips generally perform better in their OS as well.

  2. I use 29.1 with native compilation enabled, and I generally use the Full Ahead of Time compile when i can, so that all the built-in/included by default emacs code is already compiled.

  3. I use a lot of tricks from DOOM Emacs, its hard to list them all, but many of them are good. Take a look at their early-init.el, init.el, and core files to see what they do to speed things up in various cases.

  4. I used Elpaca over straight/use-package for package management, as it was designed to be async from the ground up, so it can do a lot in parallel, well, emacs version of parallel.

  5. I use a lot of built-in hooks, package-hooks, and custom-hooks, to only load packages when they are actually needed, and try to avoid global modes when possible.

my config is a bit of a mess, but if you are curious, you can see it here:

customacs

[–] [email protected] 1 points 10 months ago (1 children)

Also if you need to use windows, I found out recently that even GUI apps can be run under WSL. That seems to help the speed problem (I only tried magit and basic file handling and it is much closer to the speed under Linux)

[–] [email protected] 1 points 10 months ago

yes, definitely use WSL if you are on windows! Emacs goes from useable, to very performant when you setup WSL for GUI :)