This is a glitch that increases your speed double. There are two main ways to perform this glitch.
Open the menu in the chair and equip the broom, or whatever effect you want. Exit the chair and your speed should be doubled.
- Pressing shift at any time with broom will kill your speed
- Method II makes you susceptible to multiple soft locks. Most of which you have to go out of your way to get except Kaibutsu Softlock
Video link:.flow Speed Glitch