Superspeed is a glitched state that allows Link to walk much faster that normal.
Similar to the glitched state you get from the spindash and itemdashes, Link can not his sword.
Exclusive to version JP 1.0 only.
How to perform it
When armed, you only need to touch a climbable stairway or ladder, and from there walk into a normal ground tile to get superspeed.
You can cancel this state by pressing, screen transitioning, or jumping off of a ledge, to name a few.