eh? No idea. The tweening code I'm using came as an example of a basic Blitz program layout, ages and ages ago, possibly when BB3D was first released.
Seeing as you can't (or I don't know how to) use the automatic tweening without using CAPTUREWORLD, I've never wondered how fast / slow it was.
Seeing as you can't (or I don't know how to) use the automatic tweening without using CAPTUREWORLD, I've never wondered how fast / slow it was.