As others stated, speed is limited on all Cert carts, M1 or Lr Mates, and the DCS also has additional limits applied. Early carts did not have such restrictions but after many issues in the schools the limits were added into the default configuration. All can be changed but, these carts are set up for EDU use with students thus, typically instructors are not trying to maximize movement speed, rather teach solid programming and logic in movements. Show and tell programs like the pill cell, or battery demo do have a lot more WOW effect when running at the higher speed though.
Rich