https://bugs.kde.org/show_bug.cgi?id=356479

--- Comment #14 from Piotr Dobrogost <p...@bugs.kde.dobrogost.net> ---
Caching QX11Info::appRootWindow obviously helps (btw, starting in what version
of KDE it's available?) but this is not the solution.
Do we know the real cause?
It looks like animations should be rate limited and do not take CPU time to
calculate frames which are going to be never displayed. If so it looks very
similar to problem with touch events which is described here
https://blog.rburchell.com/2014/09/profiling-is-not-understanding.html :
"This was, in turn, causing QtQuick to run touch processing (involving costly
item traversals, as well as the actual processing of touch handling) a lot more
frequently than the display was updating."
I'm wondering why this hasn't been fixed for so long taking into consideration
that this bug seriously impacts such widely used project like KDE...

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