I have just over 125000 tracks
After 1.5 yrs of problems Roon tech support informed me Room could not handle my library of flac files on my NAS
It was how I organized them in files that was the issue
Roon doesn't really make this stuff known and their customer support model for dealing with such challenges is just plain terrible (*see the 1.5 yes it took them to tell me this).
They then would not refund my $$$ for the subscription nor allow me to return the nucleus + I purchased (with additional memory installed @ their advice ). They told me Room was working as advertised and the problem was my library
Innuos Sense has zero issues with the very same library
And support is prompt and competent when you need it.