https://community.virginmedia.com/t5/Speed/My-350Mb-connection-is-throttled-to-10Mb/td-p/3953746Multiple independent people confirmed the same thing, Superhub 3 throttles itself down to 10Mb/s in modem mode when a lot of concurrent connections are occurring.
Why isn't Virgin personnel responding any more to the thread?
Virgin, go speak to your real tier 2 or tier 3 engineers, because this isn't an issue for your standard tier 1 customer service guys.
Patch up Superhub 3 or give us an option to go back to superhub 2.
Have you thought about using a VPN for this traffic?
Please read the thread I have linked. It has nothing to do with torrent, but number of connections that superhub is unable to handle even though older version had no issue with it.