Originally posted by Time ImmemorialLol, the scene shows that they are entirely capable of moving that fast when they choose to do so. The fact that they didn't do it more often is irrelevant. If they are facing an adversary as powerful as Thor, you can bet your sweet little rectum they can and will use force speed.
So they ran really fast away from an enemy, proves nothing but makes them look even weaker. This was never used in any actual saber battle utter them realizing it was a stalemate and turned they backs and ran. If they can't take a couple of robots, they are not taking Thor and Loki.