It depends on the item being sewn. There is a rhythm with stitching and if I sew too slow or fast I mess up. Generally, my machine is at 3/4 speed. Bulky seams like binding are stitched slower.
I have a pivot function so can lift up with the foot pedal and set it to stop with either needle down/up. I like needle down so I can pivot or hold the fabric in place.
The embroidery machine is set for top speed as the machine is made for it.