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

[Andreas Schwab]

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).
 
Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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