https://bugs.kde.org/show_bug.cgi?id=465424

--- Comment #10 from Vlad Zahorodnii <vlad.zahorod...@kde.org> ---
It looks like kwin or rather breeze decoration spends a lot of cpu cycles in
fontconfig stuff, I wonder why. Could you try running kwin_x11 with
QT_LOGGING_RULES="*.debug=true" envvar and post its output here, maybe Qt would
print something

  QT_LOGGING_RULES="*.debug=true" kwin_x11 --replace

This also explains why the issue is present when compositing is disabled.
Breeze decoration would be still used in that case.

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