I'm on Free and I had to disable IPv6 because one of their routers was dropping about 60% of the IPv6 packets: GitHub, Google, Bitbucket took several minutes to

I'm on Free and I had to disable IPv6 because one of their routers was dropping about 60% of the IPv6 packets: GitHub, Google, Bitbucket took several minutes to load. As soon as I switched to IPv4 everything worked fine. I suppose that nobody at Free is really monitoring their IPv6 network in the same way they do it for IPv4.