Learning about the proper pedal interface, how to best acheive pedal force, good cycling form and bike fit, we can learn to achieve greater bike speed.
By becoming more aware of your pedal stroke, you can choose to manipulate where and how you activate your leg muscles as your foot traces the circular trajectory at the cranks.
I started riding this spring with the Carnac shoes on Look pedals (with plenty of float). About five minutes into a ride I get sharp pain on the outer edge of my feet, just behind the pedal.