Tested on variety of network (ethernet and wifi) cards, switches, routers (Cisco Business series).
I'm rather confident that it not a network problem, I'm running rather decent networking and vmware lab at home, as it's part of what I do...
When I'm scrolling through library of few hundreds albums and dozens of artists, JRemote loads graphics for the thumbnails to the point that when scrolled further it does need to load (cache) more of those and only then JRiver stops playing for like a 1/2 a second, which is very frustrating when listening loud enough.
I don't use predefined playlists as such, I play music as I go and pick the tracks based on what I like to listen at the moment, hence I rather jump across my library, scrolling it through a lot.
Back in the day (JRiver 19 or 20, not sure now) and earlier versions of JRemote were working brilliantly in that regard, I had no problems, what so ever ...
I may test much older version of JRiver tonight to see if that cures it, though ...