AMetaverse vehicle can be as fast and nimble as a quark. There's no physics to worry about, no constraints on acceleration, no air resistance. Tires never squeal and brakes never lock up. The one thing that can't be helped is the reaction time of the user. So when they were racing their latest motorcycle software, holding wild rallies through Downtown at Mach 1, they didn't worry about engine capacity. They worried about the user interface, the controls that enabled the rider to transfer his reactions into the machine, to steer, accelerate, or brake as quickly as he could think. Because when you're in a pack of bike racers going through a crowded area at that speed, and you run into something and suddenly slow down to a speed of exactly zero, you can forget about catching up. One mistake and you've lost.