In the hope that this helps someone.  I spent most of today fighting
this and found a solution.

d-i     preseed/early_command string grep -q options /etc/resolv.conf ||
echo "options single-request" >> /etc/resolv.conf ;

and then

d-i  preseed/late_command string grep -q options
/etc/resolvconf/resolv.conf.d/tail || echo "options single-request" >>
/etc/resolvconf/resolv.conf.d/tail ;

The difference in speed of install is marked.

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https://bugs.launchpad.net/bugs/417757

Title:
  [regression] all network apps / browsers suffer from multi-second
  delays by default due to IPv6 DNS lookups

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