https://bugs.kde.org/show_bug.cgi?id=358646
--- Comment #3 from Thomas Lübking <thomas.luebk...@gmail.com> ---
in addition, export KWIN_TRIPLE_BUFFER=0 should kick you into the broken path.
If that triggers it, I assume the cause to be either
a) the reversed paint/sync/swap cycle which is required to measure the time we
spend on creating the frame (::endRenderingFrame) or
b) the recently added glXWaitGL() call in ::present() ("at least the nvidia
blob manages to swap async")
latter only in glxbackend.cpp, former also in eglonxbackend.cpp
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