There are no real performance improvements available thru the Assistant software other than stability and reaction gain adjustments.
The lateral speed for pitch, roll, and the descent is controlled by the firmware via the MR's tilt angle and descent limits. A few firmware revs. back the angles and limits were adjusted to reduce speed and descent rates.
The only way to increase speed through software is to load older revision firmware which have increased tilt angles.
droneslinger.com has the archived firmware revisions.