As odd as it may sound, his Geass may grant him the power of transportation. Possibly more likely, it forces an illusion on you that slows down your perception of time, making him appear to be much faster than he actually is. I'm not sure, but I'm assuming every Geass ability affects the mind in some way. What's strange about that though is that his speed was happening while he was inside that mech, and I thought eye contact was necessary.
Whatever the case, this video is apparently taken from a PSP Geass video game. Here, Rollo's Geass is on display in a rather violent fashion. Interpret it how you will, I'm personally a bit confused. Being the genius that he is, I'm hoping LeLouch will figure out Rollo's Geass in the third episode.