If quaffed, the message "You're now moving a ludicrous speed!" will be displayed, and the user will move a really high speed for a short time. As the effect goes off the speed buff will go decreasing gradually until going back to normal; at first super high speed movement will be experienced, then the effect will be the same of a potion of speed.
While super high speed is active, every creature but the user will move at slow motion and even visual effects like the flame of a torch, the water coming out of fountains or the darkness consuming a room will be noticeably slowed, and at climbing out of a ladder will result in the player hovering above the ground.
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