I have a Beta 4 (OTA update from Beta 3) on an iPad 2, and I have to say things are a lot smoother. However, on Beta 3 I turned on "Reduce Motion" because it was so jerky, and since the iPad doesn't move around as much as an iPhone I found it rather pointless. I haven't tried turning it "Reduce Motion" back off with B4, so I can't comment on the animation smoothness there.