If you would like to display your server location on the map. e.g. London, UK. PRO plan users have option to specify multiple server locations.
This will also influence the testing locations . Worldwide will test your endpoint from selection of 20 worldwide cities, zooming to specific continents will test only from that continent. PRO plan users have ability to change or add more cities.
In milliseconds. Anything less will be in GREEN color.
In milliseconds. Anything less will be in YELLOW/GREEN color.