With nvidia proprietary (not open) 555 driver, nvidia.NVreg_EnableGpuFirmware=0 kernel option and Kwin 6.0.4.1 with explicit-sync patch I have nornal frame rate on external monitor and very small CPU usage for kwin_wayland process. But now I afraid another bug with kernel panic Series 550 freezes laptop - #161 by 5bondarenko
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