I _do_ take TV from Virgin Media and my IPv6 tunnel through Hurrican Electric is running at 187mbit today over WiFi (I'm on the 200 package). Superhub 4 in modem mode, ASUS RT-AX86U as the router
Yea, the speed issue was variable for me at least. I have tested and had full speeds but then wham -- bad speeds galore. Keep testing and see if it remains okay all the time.
---- I do not work for VM, but I would. It is just a Job. Most things I say I make up and sometimes it's useful, don't be mean if it's wrong. I would also make websites for them, because the job never seems to require the website to work.
The SuperHub 4 is generally acknowledged to not suffer from these issues; only SuperHub 3 and lower (and Hitron). Sadly I cannot find any way to get VM to give me a SuperHub 4...
All down to DOCSIS 3.1 being enabled in your area currently. While the Hub4 can work on DOCSIS 3.0 it is an unsupported config which Virgin Media won't really support. I was offered a Hub4 a while back while not being in a DOCSIS 3.1 area, but they basically said for any support or issues you'd basically be limited to a very selective few as it wouldn't be widely supported, so I didn't bother in the end. I don't know if the 2021 target for DOCSIS 3.1 being enabled everywhere is still on course due to the pandemic.