GNU bug report logs - #14966
24.3.50; Char-displayable-p is a very long running function

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Package: emacs;

Reported by: "Sebastien Vauban" <sva-news <at> mygooglest.com>

Date: Sat, 27 Jul 2013 09:49:02 UTC

Severity: minor

Tags: moreinfo, wontfix

Found in version 24.3.50

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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Message #8 received at 14966 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Sebastien Vauban <sva-news <at> mygooglest.com>
Cc: 14966 <at> debbugs.gnu.org
Subject: Re: bug#14966: 24.3.50;
 Char-displayable-p is a very long running function
Date: Sat, 27 Jul 2013 13:49:08 +0300

> From: "Sebastien Vauban" <sva-news <at> mygooglest.com>
> Date: Sat, 27 Jul 2013 11:47:30 +0200
> 
> When looking at the performance of my .emacs at startup time, I've noticed
> that (char-displayable-p) takes around 400 ms (!) to execute itself...

It calls the font driver to actually encode the character.  That could
look up several fonts.  FWIW, I see 219 ms on my i7 Windows desktop.

Unless char-displayable-p is called in an inner loop (is it?), this
shouldn't really matter, should it?
This bug report was last modified 4 years and 239 days ago.

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