I get the feeling that Roon getting slow when starting an album from Nas and even slower from Tidal
I had an issue recently whereby Tidal was taking minutes to start playing tracks that were streamed. Turned out to be an issue with my ISP’s DNS. Changed my network to use Google’s free DNS servers and the problem was resolved - instant playback.
This did not affect music I had stored locally though, so may not affect your NAS. But could be worth investigating.