SUMMARY Everything is slugish unless I force in kwinrc maxfps and refreshrate to 3x my real refresh rate. Most noticible is video playback but also windows animations. STEPS TO REPRODUCE 1. Test Big Buck Bunny 60fps version on NVidia drivers in MPV (my setups have 60Hz monitors) 2. Change kwinrc file MaxFPS and RefreshRate in composition section to 3x your refresh rate 3. Test the same video again OBSERVED RESULT Video is noticibly more fluid with that "hack". Without it, it is really not suitable for any kind of video screening. EXPECTED RESULT Video (and overall system animations) are fluid without excesive manipulation with related parameters. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE neon 5.20 (available in About System) KDE Plasma Version: 5.20.2 KDE Frameworks Version: 5.75.0 Qt Version: 5.15.0 ADDITIONAL INFORMATION NVidia drivers 450
After testing kwin in xfce session, I believe, that plasmashell is at fault here. kwin under xfce runs great with composing. under plasmashell..not so
but, on slihtly less powerfull setup (laptop with nvidia) running kwin under xfce is not really stable. only thing that helps with jittering playback is to turn of composing completely. i do not like this solution, cause composing allows me to move window to another workspaces but to still record screen/window capture them. without it, it losses lots functionally
This bug was reported against an outdated version of KWin. We have made many changes since the. If the issue persists in newer versions can you reopen the bug report updating the version number.