https://bugs.kde.org/show_bug.cgi?id=3D352068

--- Comment #3 from Thomas L=C3=BCbking <thomas.luebking@gmail.com> ---
valgrind --tool=3Dcallgrind kwin_x11 --replace &

Since valgrind severely slows down execution, you should be comfortable with
controlling the system from VT1 or ssh (your GUI login will become virtually
unusable)

Let's maybe try to narrow the issue first ;-)

- Please attach forementioned supportInformation and (assuming this is GL
compositing)
- then run "kcmshell5 kwincompositing" (config dialog, the compositor can be
suspended at this time) and
- set the backend to xrender compositing, (in doubt resume the compositor a=
nd)
see if the issue remains.
- If not, switch back to OpenGL (assuming you're using it)
- but set the tearing prevention to "none"

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