Mr

I use this app regularly it works really well. My PC has a hard wired internet connection and a WiFi connection. The iPad of course has a WiFi connection. I run a speed test on both the PC and the iPad at the same time and the difference gives me the variable efficient of the router.
The efficiency varies from 98% to as low as 60%

Sparks1722 about Speedtest by Ookla, v3.7.6