Overview
Improve Emacs flyspell responsiveness using idle timers.
Quickstart
(require 'flyspell-lazy)
(flyspell-lazy-mode 1)
(flyspell-mode 1) ; or (flyspell-prog-mode)Explanation
This package is only useful if you are experiencing performance
issues with Emacs' built-in flyspell-mode. Specifically, keyboard
responsiveness was significantly degraded on OS X before GNU Emacs
24.3. See this (now resolved) bug:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2056
This package reduces the amount of work done by flyspell. Instead
of checking instantly as you type, spelling will be checked when
Emacs has been idle for a short time. (Vanilla flyspell-mode
does not use idle timers but a subtle combination of hooks and
sit-for.)
This package also forces flyspell-mode off completely for certain
buffers.
To use this library, add the following to your ~/.emacs file
(require 'flyspell-lazy)
(flyspell-lazy-mode 1)Then use flyspell-mode as you normally would. This package does
not load flyspell for you.
flyspell-lazy-mode will invoke spellcheck less frequently than
vanilla flyspell-mode, though this can be changed somewhat via
customize.
Notes
If you are using aspell instead of ispell on the backend, the
following setting may improve performance:
(add-to-list 'ispell-extra-args "--sug-mode=ultra")Compatibility and Requirements
GNU Emacs version 24.4-devel : yes, at the time of writing
GNU Emacs version 24.3 : yes
GNU Emacs version 23.3 : yes
GNU Emacs version 22.2 : yes, with some limitations
GNU Emacs version 21.x and lower : unknown
No external dependencies