A speed drop to below 100 is often due to a faulty ethernet cable - have you swapped it for a new Cat6a one?
Also check in the PC settings what the speed is set to in the NIC cards setting.. they sometimes "drop" to 100Mbps - see that it is set to 1GB.
Also check its drivers are all up to date.
Finally. as you expect >100Mbps then connect a 1GB enabled computer/laptop, with up to date drivers, via a NEW and working Cat5e/6a ethernet cable, directly to the Hub which you have put into “modem mode”
(
https://www.virginmedia.com/help/virgin-media-hub-modem-mode ).
This ensures that NO other devices are connected
Test speeds at
https://speedtest.samknows.com/ - try on 2 different browsers.
If they are still low – boot your device into Windows safe+networking mode - to disable any potentially interfering software - and try again.
There are many posts on here (I have a list of ~30!) 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, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.