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There actually is. An increasing number of ISPs is going IPv6-only with central carrier-grade NAT for IPv4. Those gateways are often overloaded, resulting in vastly better performance over IPv6.

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IPv6 traffic is much slower. In my case (I use Miredo client), link to Portsmouth, ServerHouse, GB is up to 30Mbit by IPv4 but no more than 1Mbit by IPv6.

You have native IPv4 and IPv6 over a tunnel, so of course IPv6 is going to be slower.

The point is that for an increasing number of users, it's the exact opposite.

Except this study shows no difference in performance, but a 9x higher failure rate to establish an ipv6 connection.

The study did a good job breaking down the different IPv6 connectivity types, but didn't discuss different IPv4 connections. GP is comparing native IPv6 to IPv4 CGNAT, but the study seems to be comparing differing forms of IPv6 to native IPv4.

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