GNU bug report logs - #14886
Slowdown on font-lock-fontify-buffer

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alan Mackenzie <acm <at> muc.de>
Cc: martin rudalics <rudalics <at> gmx.at>, Paul Eggert <eggert <at> cs.ucla.edu>, 14886 <at> debbugs.gnu.org, Juanma Barranquero <lekktu <at> gmail.com>
Subject: bug#14886: Fwd: bug#14886: Fwd: A significant slowdown calling font-lock-fontify-buffer from a hook
Date: Wed, 30 Oct 2019 13:52:35 +0100

Alan Mackenzie <acm <at> muc.de> writes:

> I am calling:
>
> emacs -Q --eval "(progn (add-hook 'prog-mode-hook #'font-lock-fontify-buffer) (setq debug-on-error t))" ~/emacs/emacs.bzr/trunk/src/xdisp.c
>
> using both emacs 24.3 and the trunk.  In 24.3, the processing is
> immediate (~2s), whereas in the trunk it takes ~28s.

This function still takes a long time when called from the hook, but in
2014 the function was marked interactive-only, so I don't think this is
something to be fixed -- at least not at this point.  So I'm closing the
bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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