We are still talking a fraction of a millisecond, a few hundred microseconds at most. People are blowing out of proportion latency saved with v6, it's negligible at best, or at worst let's not forget IPv6 is two separate island because two tier-1 carriers refuse to peer (Cogent & HE).
Google's stats claim that it's 10-20ms for many countries, for example both the US and Canada show the latency impact of v6 as being -10ms. This is per round trip too -- between the connection handshake, congestion window slow-start and serialized requests it adds up to something significantly bigger than a few hundred microseconds.
> let's not forget IPv6 is two separate island because two tier-1 carriers refuse to peer (Cogent & HE).
The Cogent island must be very small, because I'm single-homed on HE and had actually forgotten about that.
Or perhaps v6 isn't split into two separate islands after all, and this is just yet another weird claim people make about v6 that doesn't match reality.
