Start/Stop lag.
With the original Bolt and Roam you can get better Start/Stop results by pairing a Wahoo Speed Sensor.
Detecting you have stopped using GPS is tough and subject to interference or low signal.
Detecting you have stopped using a Speed Sensor.... immediate.
BTW, Don't calibrate the speed Sensor to the Wheel diameter, let the Bolt/Roam automatic process do that.
Barry