Optimize init startup time

emacs/init.org

@@ -10,7 +10,44 @@ Enables lexical binding for everything in init.el:
   ;;;  -*- lexical-binding: t; -*-
 #+END_SRC
 
-Variables:
+** Garbage collection
+Some GC tweaks [[https://github.com/hlissner/doom-emacs/blob/develop/docs/faq.org#how-does-doom-start-up-so-quickly]["borrowed" from Doom emacs]].
+
+Turn off GC during init and restore it afterwards:
+#+BEGIN_SRC emacs-lisp
+  (setq gc-cons-threshold most-positive-fixnum
+	gc-cons-percentage 0.6)
+
+  (add-hook 'emacs-startup-hook
+      (lambda ()
+	(setq gc-cons-threshold 16777216
+	      gc-cons-percentage 0.1)))
+#+END_SRC
+
+Also suppress GC for 1 second after the minibuffer is active to avoid stuttering autocompletion and other GC hangups:
+#+BEGIN_SRC emacs-lisp
+  (defun defer-garbage-collection ()
+    (setq gc-cons-threshold most-positive-fixnum))
+
+  (defun restore-garbage-collection ()
+    (run-at-time
+     1 nil (lambda () (setq gc-cons-threshold 16777216))))
+
+  (add-hook 'minibuffer-setup-hook #'defer-garbage-collection)
+  (add-hook 'minibuffer-exit-hook #'restore-garbage-collection)
+#+END_SRC
+
+** Unset file-handler-alist during initialization
+Another optimization from [[https://github.com/hlissner/doom-emacs/blob/develop/docs/faq.org#how-does-doom-start-up-so-quickly][Doom Emacs]].
+#+BEGIN_SRC emacs-lisp
+  (defvar file-name-handler-alist-backup file-name-handler-alist)
+  (setq file-name-handler-alist nil)
+  (add-hook 'emacs-startup-hook
+	    (lambda ()
+	      (setq file-name-handler-alist file-name-handler-alist-backup)))
+#+END_SRC
+
+** Variables
 #+BEGIN_SRC emacs-lisp
   (setq vc-follow-symlinks t)
 #+END_SRC
@@ -1745,17 +1782,17 @@ Integrate Google calendar with org-mode:
 * Mode line
 * UI
 Get rid of the janky buttons:
-#+BEGIN_SRC emacs-lisp
+#+BEGIN_SRC emacs-lisp :tangle ~/.emacs.d/early-init.el
   (tool-bar-mode -1)
 #+END_SRC
 
 And the menu bar:
-#+BEGIN_SRC emacs-lisp
+#+BEGIN_SRC emacs-lisp :tangle ~/.emacs.d/early-init.el
   (menu-bar-mode -1)
 #+END_SRC
 
 And the ugly scroll bars:
-#+BEGIN_SRC emacs-lisp
+#+BEGIN_SRC emacs-lisp :tangle ~/.emacs.d/early-init.el
   (set-scroll-bar-mode nil)
 #+END_SRC