Don’t worry about control or being unable to react in time etc or how it affects you physically.
I’d say fly 10 mph, might still be faster than running 100mph when going to point b. You can fly high then glide down at a faster speed and any destination is a direct line.
10mph is pretty dang fast, especially since you can just go over buildings and obstacles. Slower than a bike in a straight line, but much faster otherwise when you don’t need roads.
In most populated areas, you can get just about anywhere faster than any other mode of transportation.