Problem with Roon and Nucleus + tracks loading slowly

Thanks Ben-
when you say “this Nucleus” what do you mean? or do you just mean a Nucleus in general? Is my Nucleus + working correctly? (need to know if it isn’t before I try and sell it)

When you ask about setting up another core device what do you mean? Isn’t the issue with ROON and my library?
Wont I always have these issues with my library if I continue to try and use ROON? I had assumed that I cant use ROON with my lbrary?