With maglev and LSM propulsion there are significant advantages of using higher top speeds than are used with other propulsion means.
In addition to travel time there are stopped times associated with opening and closing doors and passengers leaving and entering the vehicle. For a transit system with a top speed of 25 m/s and a 20 second stop every 1 km the average travel speed is 12.8 m/s (29 mph, 46 km/h). This is twice the average speed of most transit systems when operating with this short station spacing. The reduced headway means passengers do not need to wait very long for a vehicle and this decreases average trip time even further.
The common metric for rating a transit system is passengers per hour per direction, but this is only part of the story.
A better metric is the product of average speed times capacity, where average speed means the total distance divided by total time, including the average time a rider must wait for a vehicle.