The bottle neck that makes Traktor stutter and lag in all sorts of situations

em5

I tried to get Traktor to stop stuttering while generating stems, to be able to stem separate a wished song from the audience at home parties. I tried shifting my S8 and Z1 through all USB ports, both directly and using different USB hubs with helpful buffers for studio situations. Then I just tried outputting through my internal PCI sound card (Yes really, PCI, Audigy 2 ZS), and the stuttering STOPS.

The graphs stutter as they always do though. I changed to NVIDIA studio drivers, tweaking its settings, disabling all sorts of stuff, 100% DPI, even running it in windows 7 comparability mode - Nothing touches the ~15 FPS that makes reading the moving waveforms so much more tidies. Something interesting is that when generating stems nvlddmkm.sys (NVIDIA driver) is spiking hard in Latencymon: DPC routine execution time: 1274 µs (way over the safe zone)dxgkrnl.sys (DirectX graphics kernel) also high at 543 µs. Its not like RTX2080S can't draw a 2D graph. Its the same on my laptop with intel iris XE, and my super old emergency backup laptop)

Is the bottle neck in Traktor its graphic routine?