Easy. Just reduce the numbers that start with "Rotate" and "Blank" on the bottom right.
If you change these 5 values to all zero's, it just blinks between changes. Feels quicker.

btw, you can experiment all you like. You can't do any harm. Also, there is no need to reboot.
So just write down the default values, then try reducing each one to ZERO and apply and see what difference it made.