Maybe, if you’re happy to “have a go” load roon core on your Win10 machine & try that to prove if there’s a NAS problem. It’s not a major task to migrate cores but it depends how keen you are to get to the bottom of the issue.
More migration info can be found at:-
A search for Synology might be helpful, for example…
I started life with Roon using a five year old Synology 1513+ which according to Roon was woefully below spec with only a two core Atom processor. It worked just fine and sounded great. But once my library grew to over 1,000 albums, it started to get slow switching from playlists or songs, or adding new albums to the library. It always played fine. The remote just became sluggish.