Quote: "That's probably because all sprites are really 3D planes... that's why the blue backdrop shows up when we use sprites."
Gee, wish I had said that.....oh wait, I did:
Quote: "(my understanding is that DBP uses 3D planes to display sprites anyway)"
This does not mean that perhaps DBP or it's plugins include optimizations for sprite handling that could speed things up. Is it possible that having the backdrop on / off will make a difference in speed? I don't know at this point, but I suppose it is worth investigating.