Why not show how much the video is sped up in the demo on your landing page?
I think though that it's very clear that it's sped up a lot at some moments. Plus, you can sort of see it at the speed of the messages on the left.
But you're right, for the sake of transparency we'll figure out a way to show it better.
EDIT: For the sake of transparency I can already tell you that it's sometimes sped up to 10x, mostly when it's navigating cause the robot hardware is slow. And by the way, the version we'll ship in February has a much faster drive train.