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refactor: move startup optimizations to doom.el

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I move our hackiest and least offensive startup optimizations to core,
so they're easy for me to keep track of (they'll likely change often,
between major Emacs releases), to keep them from affecting non-Doom
profiles, and make it easy for readers to use as a reference.
This commit is contained in:
Henrik Lissner 2022-09-13 13:08:37 +02:00
parent 9ac167fb84
commit 42d88421ba
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3 changed files with 248 additions and 242 deletions
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41
lisp/doom-start.el
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@ -95,47 +95,6 @@
(add-hook 'doom-first-buffer-hook #'gcmh-mode)
;;; Startup optimizations
;; Resizing the Emacs frame can be a terribly expensive part of changing the
;; font. By inhibiting this, we halve startup times, particularly when we use
;; fonts that are larger than the system default (which would resize the frame).
(setq frame-inhibit-implied-resize t)
;; Remove command line options that aren't relevant to our current OS; means
;; slightly less to process at startup.
(eval-when! (not IS-MAC) (setq command-line-ns-option-alist nil))
(eval-when! (not IS-LINUX) (setq command-line-x-option-alist nil))
;; HACK: `tty-run-terminal-initialization' is *tremendously* slow for some
;; reason; inexplicably doubling startup time for terminal Emacs. Keeping it
;; disabled will have nasty side-effects, so we simply delay it instead, and
;; invoke it later, at which point it runs quickly; how mysterious!
(unless (or (daemonp) init-file-debug)
(advice-add #'tty-run-terminal-initialization :override #'ignore)
(defun doom-init-tty-h ()
(advice-remove #'tty-run-terminal-initialization #'ignore)
(tty-run-terminal-initialization (selected-frame) nil t))
(add-hook 'window-setup-hook #'doom-init-tty-h))
;; Reduce *Message* noise at startup. An empty scratch buffer (or the dashboard)
;; is more than enough, and faster to display.
(setq inhibit-startup-screen t
inhibit-startup-echo-area-message user-login-name
inhibit-default-init t)
;; Get rid of "For information about GNU Emacs..." message at startup. It's
;; redundant with our dashboard and incurs a redraw. In daemon sessions it says
;; "Starting Emacs daemon" instead, which is fine.
(unless (daemonp)
(advice-add #'display-startup-echo-area-message :override #'ignore))
;; Shave seconds off startup time by starting the scratch buffer in
;; `fundamental-mode', rather than, say, `org-mode' or `text-mode', which pull
;; in a ton of packages. `doom/open-scratch-buffer' provides a better scratch
;; buffer anyway.
(setq initial-major-mode 'fundamental-mode
initial-scratch-message nil)
;;; Language
;; Contrary to what many Emacs users have in their configs, you don't need more
;; than this to make UTF-8 the default coding system: