Is IPv6 'faster' than IPv4?

Practical impact? Not really. The effect is pretty small. Where you might run into it is in high latency links (think satellite) where the MTU (maximum transfer unit) is small, which magnifies the impact of the larger overhead IPv6 requires. That's an edge case. The other area where you'll see impacts is when you're doing 6 to 4 translations in the network path, as that always takes some time. But if you had a pure v6 path to that other v6 host such latencies won't be an issue. In these days of…