@ Markus's #8 comment: as I mentioned "Note that the DNS queries go over
IPv4 (transport), there is no IPv6 _connectivity_ involved here.".

You also state 'so all IPv6 requests are answered by an IPv6 enabled DNS
server."; well, unless you configured IPv6 DNS resolver addresses in
your /etc/resolv.conf then queries will still go over IPv4 (transport),
even though they are AAAA queries. AICCU only provides IPv6 connectivity
(transport) it does not configure DNS resolvers though.

@ Bernard's #9 comment: most likely your livebox contains one of these
broken DNS resolvers. Happens a lot that CPEs have this issue. Try the
below to check this out. Configuring resolv.conf with OpenDNS or other
working DNS servers (eg the ones of your ISP directly, instead of the
livebox) might solve your problem. Do also please realize that this
problem ALSO occurs on other platforms than Linux, eg Windows, which is
what the majority of people are using; what to use is a choice of the
user afterall....


To verify this, do a:
for i in `cat /etc/resolv.conf | grep ^nameserver | cut -f2 -d' '`; do dig @$i 
www.microsoft.com AAAA; done

This should return quite quickly, even though no AAAA records for
www.microsoft.com exist yet. Now, if you have a broken resolver
somewhere along the way, these requests won't return quickly (unless
they are locally or on-path cached as negative).

-- 
[karmic regression] all network apps / browsers suffer from multi-second delays 
by default due to IPv6 DNS lookups
https://bugs.launchpad.net/bugs/417757
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