In Plasma desktop settings set refresh rate to match my monitor to 120Hz, AdaptiveSync Always, Enable HDR, Allow tearing.
Now gameplay looks cinematic smooth.
Also apply my previous comment needed.
CS2 launch options:
%command% -threads 32
Threads depending on my CPU threads.
Also:
__NV_PRIME_RENDER_OFFLOAD=1 __VK_LAYER_NV_optimus=NVIDIA_only __GLX_VENDOR_LIBRARY_NAME=nvidia
not needed.