[pkscout]

From what I gather it displays art from the album level, and it downloads it while playing correct?

I messed around last night and it does indeed change with the changing tracks, just that the delay is if it needs to download new stuff. By trial and error it looks like it downloads (and assigns) art on an album level so even changing to a different album will cause a delay.

It's on an artist basis. If you listen to the same artist but songs from a different album there should be no delay. In fact, Artist Slideshow won't even change (or stop downloading) anything until you have actually change artists.