Makes the game go a lot faster. This is best turned on to skip boring parts and then turned off when you actually want to play.
Enable the toggle to change the speed of the game. Avoid setting a really high value for this or the game may stop feeling smooth. The more powerful your computer, the higher you can set this. This can also be used to make the game slower if a value of less than 1 is used. A value of 0.5 would make the game go half as fast, this is useful for slow motion.