I kinda/sorta recall you don't have Mac hardware. Maybe I remember wrong?
My hardware is rather capable: 2014 Retina iMac with quad 4GHz i7s, 32GB RAM, and Radeon R9 M295X graphics. Running OS X Mojave, 10.14.6 .
On the other hand, one would expect any Mac that can run a modern web browser, and have that web browser smoothly scroll through a page with images on it, to be able to smoothly scroll with a native Mac app like JRiver Media Center.
Brian.