According to linkedin it varies and is up to 40% in some cases they measured: https://www.linkedin.com/pulse/ipv6-measurements-zaid-ali-kahn/ https://www.linke

According to linkedin it varies and is up to 40% in some cases they measured: https://www.linkedin.com/pulse/ipv6-measurements-zaid-ali-kahn/ https://www.linkedin.com/pulse/ipv6-measurements-zaid-ali-ka... A fast NAT gateway which is lightly loaded might make little difference, a heavily loaded one can make a big difference. Google stats also show slight latency improvements for IPv6: https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-adoption https://www.google.com/intl/en/ipv6/statistics.html#tab=per-... Of course these are generalised stats, there will be some users with tunnels which will impair IPv6 performance, while other users might be behind multiple layers of NAT.