The first thing I noticed this weekend after the change was that in station screens my mouse pointer is noticeably sluggish. I assume this is related to the addition of the transparent station screens with the actual station rendered in the background. Anyone have this issue? It's something I'm getting used to, but how strange. I apologize if this has been discussed somewhere else already.

G4 Dual 1Ghz, 1.25MB RAM, Radeon 9000 64MB, Mac OS X 10.3.5

I have the same problem,and i have a G5 1.8 mgh , 9800 pro ati 128 mg OS X 10.3.5. Bizarre...
Banzaiiiii

Yeah, rendering the station is not the fastest thing in the world.
You can turn off station rendering to speed up the interface in the Graphics Options.