Hello DaveVB

Depends on what you're seeding. Larger seeds, such as cereals go in deeper & are more forgiving, so can travel faster. Countless studies have shown that slowing down for seeding small seeds like canola that need to be only 1/2" below ground pays off big time with increased yields. Going too fast will cause the seeder to bounce around & not have even seeding depth.

 https://www.realagriculture.com/2013/06/canola-school-seeding-speed-seed-depth-whats-the-impact/

Reason for edit: Typo.