I know bubkes about IT, but it appeared that the Roon software, which must be extensive, overwhelmed the Computer. I am guessing that I am not the only person that has had this issue and that Roon has realized that their product may perform better on a dedicated Linux Computer optimized to run their product. I am also guessing that they just don’t want to come out and say this, because they don’t want to discourage people from buying the software.I know nothing about the Nuclues. But Roon's hardware requirements are modest and are listed on the website.
With over 100,000 tracks, I am a very satisfied Roon user. I originally installed the Roon core on a 2012 Mac Mini loaded with Windows Bootcamp. I'm now using Windows 10 PC that I built as the Roon Core for audio and also using other software for moves -- i.e. a HTPC.
With +100k tacks, no track loading delays or problems have been experienced. I'm a big fan of Roon's interface and have no problems with how my music was originally organized.
I entered the PC Audio world in 2006. Since then, I have had several DAC's and tried several different Apple and Windows based music (software) players. Roon is the latest and for my purposes is a winner.
I use Roon with a Windows Surface and Laptop acting as remotes and it drives a microRendu connected to a Lampizator DAC. I'm obviously very satisfied with Roon's sonics and I'm especially happy, because I intend to use Roon as the front-end of a whole house music system. For that purpose, it just works -- no problems finding end points etc.