If you think that you have a BB speed problem, then to check the speeds coming in to your Hub properly, and whether they match what you should be getting, you cannot rely on wifi tests, - no BB supplier guarantees those - only speeds "TO" the Hub are guaranteed. So, you need to test speeds directly over a NEW ethernet cable (Cat5e/6 or better) connection - to a bona fide GB enabled computer/laptop (not one with a 10/100 NIC card), which has the up to date drivers AND with the Hub put into modem mode (see VM wbsite for the "how to do that"). Test at speedtest.net to your nearest VM server - try 2 different browsers as well.
If they are still low – boot the device into safe+networking mode and try again.
Report back what that gets . There are many posts on here where unknown software or other connected devices are limiting speeds on tests and this ensures that they are out of the equation and you get a true speed reading
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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.