Curiously, I can't reproduce this using any of the applications I've
tried. While I do have some level of IPv6 networking, I've deliberately
turned it off for this test, and in any case I'm testing at the tcpdump
level; I can clearly see the A and AAAA queries going out in parallel,
rather than what sojourner was seeing which was the AAAA query going out
and then a long timeout.

That means I need to figure out what's different about our environments.
One useful place to start would be an strace of a fairly simple client
such as w3m. Could you please:

  * install the strace and w3m packages
  * run: strace -f -s 4096 -o w3m.trace w3m http://some/url/of/your/choice
  * quit w3m once the page has loaded (shift-Q)
  * attach w3m.trace to this bug

This may not be sufficient for me to work out what's wrong, but it will
give me a bit more to go on.

-- 
IPV6 causes slow internet access
https://bugs.launchpad.net/bugs/313218
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