Ahhh. Ok first thing is the speedtest app is known to give poor results when compared running the same test in a browser at speedtest.net (I have done the controlled experiment myself)
That said wifi tests per se are not good for determining what speeds you are getting. For example, my Macbook Air and iPhone7 both get 220mbps on my Vivid200 wifi connection (and 220 on ethernet of course). However, on wifi, they only get that when I put them onto the 5GHz network. Sat in the same spot if I then flick them over to the 2.4GHz network, they max out at 70-80mbps (others on here get even lower [<50] on their set ups) - it's just the limitations of the technology!
If you are actually connecting on 2.4 at the time - then that's what you will get.
You can try separating the SSID's of the 2.4 and 5 GHz wifi bands on the Hub by renaming them in the settings - and at the same time switch off "channel optimisation" apply and save the settings. All wifi devices will need reconnecting to the best SSID at each location. Also use a wifi scanning App to find the best wifi channels to use (just select and use channels 1,6,11 on 2.4GHz) - this often helps Hub3 users get better wifi performance - but its still no substitute for getting your own better kit 🙂
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.