How are you doing the speedtests? This is the "recommended" procedure.
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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, can you test speeds directly like this.
Connect a 1GB enabled computer/laptop, with up to date drivers, via a NEW and working Cat5e (or better) ethernet cable, directly to the Hub which you have put into “modem mode” (
https://www.virginmedia.com/help/virgin-media-hub-modem-mode ). Thats to ensure only one device is connected. Test speeds at
https://speedtest.samknows.com/ - try on 2 different browsers.
If they are still low – boot you device into windows safe+networking mode to disable any potentially interfering software - and try again.
There are many posts on here where QoS software, unknown/flaky software, old network card drivers, corrupted browsers, bad cables or other connected devices are limiting speeds on tests.
Report back what that gets.
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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.