Wow, the 194.168.4.100 and 194.168.8.100 in particular DNS servers are well borked. No chance resolving
www.xbox.com on either, and
www.bbc.co.uk only resolves on the first one! I'm switching DNS while they sort this one out. They are really having a bad week!
Maybe it is the speed doubling but my area has had 100Mbit for about a year now. It's funny it's the edge of the VM network and nowhere internal. That said, my speed is great now and ping times are back to normal.