Renoise reporting extremely high CPU usage (99%)

That answers one of my question I asked a few weeks back about CPU usage.

My setup is a i5-9600k (6cores, no hyperthreading) and a Focusrite 2i2 audiointerfae, apparently that CPU is way too overkill for the audiointerface, who would have thought?
I wonder which audiointerface to get next time, any suggestions?