@MikeH did you know that when a loco is designated a "switcher" under the Legacy system, the speed steps are halved. I guess the idea is to give an operator more "resolution" for slow-speed switching.
In real life, an SW- switcher could only go about 45 mph. And I bet many spent their entire careers running slower than that, unless they were dead in tow as part of a road freight, on the way to the repair shop, etc. How big is your layout? If you really don't like your Legacy version, there are plenty of other, faster-running switcher models out there.