Im not sure what meaningful information you are expecting this to provide.
As it says on the pages you mentioned:
"The dashboard throughput test live tool performs a basic data throughput test to the Meraki Dashboard. It is not meant to accurately test the speed an Internet/WAN link is capable of - for this please use an internet speed test. For more information, please see the Meraki Documentation."
Even if you run it manually back-to-back you will get different results and it bears no resemblance whatsoever to the actual throughput of your internet circuits.