The cell is the slowest mandatory rate
Beacons and group-addressed frames go out at the lowest mandatory rate, and slow means far — so that one setting quietly defines how big your cell is and how much airtime overhead costs. Leave the ancient 1 Mbps rate mandatory and the cell balloons; raise the floor to 12 or 24 Mbps and it tightens to something fast and healthy.
This lab lets you toggle each rate between mandatory, supported and disabled (or apply a preset), then drag a client to read its achievable rate, beacon rate and management rate at any distance — turning red when it falls outside coverage.