I was hosting the core on a souped up Mac mini dedicated to that task alone. I turned off everything else and had 16 GB memory and a solid state drive.
I’m not trying to say Roon can’t sound quite good - it did for me. But, the native OS and library management software to my Auralic unit sounded significantly better.
I can easily imagine that Grimm and WADAX have optimized things such that Roon performs at a very high level. But I stick with my contention that making software work across a wide variety of hardware/platforms is very difficult - and would be nearly impossible to optimize for each. Just like Windows.
There is an important take away in this that I’ve mentioned before. For those of us with hardware that’s Roon certified - that also has a native app - why not have both? In my Auralic unit, I could easily have Roon for everyday listening and switch to Lightning DS for serious listening. It’s perfectly fine to have both options. That said, I am also perfectly fine with the UI and operability of Lightning DS. So, I just don’t really need Roon. I’d keep it if it sounded better but it doesn’t.
My experience only. YMMV.
Best,