Any reason www.python.org is slow?

[Martin v. Loewis]

>> If your computer does have IPv6 connectivity, but it's broken
>> (i.e. you have a gateway, but eventually packets are discarded),
>> you see the IPv4 fallback after the IPv6 timeout. The IPv4 connection in
>> itself then would be fast.
> 
> I think it's what most users experience when they are talking about
> this problem. It manifests itself on many Linux setups.

This (*) is something I really cannot believe. What specifically
happened on these Linux setups? What specific network use these people,
and why do they get bad IPv6 connectivity?

Regards,
Martin

(*) that there are many