Your statement “It doesn’t really [describe the test conditions] …” is not correct. The roon usage that caused 1% utilization was spelled out:
You did originally guess that
@Robem, roon neither upscales nor transcodes. It is not a video processing system. It decodes various digital audio formats to PCM or PWM and performs various digital signal processing tasks on the decoded data, such as the upsampling I tested.
That’s all the info I’ll be providing to you.