GNU bug report logs - #43177
Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 43177 <at> debbugs.gnu.org, rpluim <at> gmail.com, emacs <at> Alexander.Shukaev.name
Subject: bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date: Thu, 03 Sep 2020 21:24:24 +0300

> From: Andreas Schwab <schwab <at> linux-m68k.org>
> Cc: Robert Pluim <rpluim <at> gmail.com>,  43177 <at> debbugs.gnu.org,
>   emacs <at> Alexander.Shukaev.name
> Date: Thu, 03 Sep 2020 19:51:17 +0200
> 
> On Sep 03 2020, Eli Zaretskii wrote:
> 
> > Do we understand why including the x backend produces such a huge
> > delay?  Where is most of that time spent, and why?
> 
> My guess would be that probing fonts via the x backend is expensive due
> to round trips to the X server (and the X server is quite busy during
> that time).

If that is the reason, I guess we should try to minimize the number of
fonts for which this is done.  Like, for example, set up some data
structure to be consulted when a deciding whether a given font should
be used with the x backend.  After all, the number of fonts for which
that backend is needed is quite small, basically bitmapped fonts.

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