First the good news. Before connecting the NUC to the router directly I tried Tidal via Roon again and it worked fine. Thinking about it I suspect the problem was Roon was still building its initial database when the problem occurred and now a couple of days on the build is complete. This is probably because the atom based NUC didn’t have enough resources to play the tidal stream and build the database at the same time.
As regards the atom NUC is is running fine in normal use now with no dropouts or stuttering. For the test of the Roon software I only imported about a third of my library to DAS on the NUC. I have my complete library on a NAS. The size of the Roon library for testing is 1408 albums, 20477 tracks, 646 artists, 15371 lyrics found, 6644 reviews and bios and 5863 images. My next test is to change the library to my NAS and see how the NUC handles that.
I am prepared to buy new hardware but for testing purposes just used what I had lying around and the atom NUC had a 1Tb SSD so seemed ok for test purposes.
One thing you don’t say in your minimum system requirements page is the minimum SSD space required for the Roon install. I say this as I have several 32Gb SSDs lying around but you guys talk about 64Gb and above. Seems silly to buy another if I don’t need to.
Thanks for your help. This can be marked solved now I think.