@Raffles27 that is entirely normal the app measures the speed of the connection to the hub when you test speeds on a device you have to allow for roughly 8% of network overheads which the system requires to get data to the right destination. Also a speed test on a device reports the slowest part of the link which can often be WiFi speeds in your home.
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
