Routing for IPv6 traffic is sometimes marginally faster than v4 (cf. https://www.google.com/intl/en/ipv6/statistics.html https://www.google.com/intl/en/ipv6/sta

Routing for IPv6 traffic is sometimes marginally faster than v4 (cf. https://www.google.com/intl/en/ipv6/statistics.html https://www.google.com/intl/en/ipv6/statistics.html), but this is probably more a matter of v6 traffic not using some older, slower v4-only networks.