Apple says that as many as 70 percent of connections to www.apple.com from certain ISPs (like Verizon Wireless) come in over IPv6. About 40 percent of connections from Belgium, the world leader in IPv6 deployment, come in over IPv6. More and more big websites are finding that page load times over IPv6 are faster than over IPv4. For instance, Facebook is seeing 45 percent IPv6 HTTP requests, which complete 15 to 30 percent faster than IPv4 requests.
from http://arstechnica.com/apple/2016/06/ipv6-ecn-qos-and-other-networking-improvements-in-ios-10-and-ma...
