What do you adjust on a programmable servo?

I have an afrc servo for my Yokomo rd2, and I checked what the programming options are, and I’m afraid to touch anything on it.

It is crazy fast, the gyro is shaking on it at the lowest setting, but slowing it down seems like counterintuitive - I can buy a slower servo for the fraction of the price.

When you program your servo, what exactly are you adjusting on it?