SUMMARY
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On a hybrid setup (External monitors connected to NVIDIA GPU, laptop display connected to internal intel GPU), there is extreme stuttering of the UI, GLXGears will run at 1/2 the refresh rate of the displays.
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(Note, on plasma 5.x, using `KWIN_DRM_USE_MODIFIERS=0` would resolve this issue, but in 6.x, either this env. variable is ignored, or does nothing)

I've attached a video showing this issue, both my external monitors are 120Hz, and the laptops own display is 144Hz, so theoretically, the minimum framerate I should get is 120Hz, but, you can see when doing anything like moving windows around, the glxgear window stutters and framerate drops significantly1.


SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0