One month has passed and it is running stable. CPU usage is around 20% in power saving mode and less than 10% in performance mode. In this condition, it seems to be no problem to have HQPlayer co-located. I would like to try it sometime.
And… Roon ARC working
I use a BeeLink GTR mini-PC with an i5 8th generation and 16GB RAM - it works brilliantly across 4 zones - only issue is Fan noise which doesnt matter to me since its not in the music room - have a Synology NAS elsewhere on the LAN and all works flawlessly with the CPU barely breaking a sweat.
I used to install Roon Core on a Core 2 Duo MacBook Pro and had no problem, so I thought it would work even without a high power CPU. So I tried it on NucBox5 and had no problem.
As long as I don’t do high-load DSP processing, there seems to be no problem with a CPU of that level. Small is justice!