bug#24634: 25.1 on Windows (native and cygwin+w32): high CPU load with "wavy" characters

[Eli Zaretskii]

> From: Georges Ko <gko@gko.net>
> Date: Sat, 08 Oct 2016 01:01:40 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> ﹏
> >> 
> >> 
> >> 
> >> ⌇
> >
> > What font(s) is/are used on your system to display these characters?
> 
> I did some tests with "runemacs -Q", with the following results as an
> org-mode buffer.
> 
> I can mitigate the problem by using language environment "English" and
> font "MingLiu-SIZE" (2nd step), the worst case being language
> environment "UTF-8" and font "Courier NEw-SIZE" (3rd step).

So Symbola and Courier New don't cause slowdown, while MingLiu does?

Do you have some custom fontset setup, or does Emacs use MingLiu for
the WAVY LOW LINE by default, in "emacs -Q"?

(But the way, setting language environment to UTF-8 on Windows is not
a good idea, it will cause you trouble unless you make further
customizations to countermand that.)

Thanks.