Hi Rene, > No wonder they have no effect if you use a KDE5/Plasma5 desktop nowadays. Do you? In that case, have you tinkered with the various options of the kwincompositing KCM? Kwin is already set to OpenGL compositing - however window content painting and compositing are two separate steps. So while I am happy with kwin's compositor performance, I am rather dissatisfied with the performance the window content itself is drawn. Is there any option to instruct QT5 to use the OpenGL graphics backend? Best regards, Clemens