I've been struggling with this bug as well, for me it started with
updates I installed on 3rd sept even though I had no problems like this
in karmic earlier (at this point I installed updates from about two
weeks back though). It affects all network apps (not just browsers). I
originally filed a
What I was seeing what 20-40 seconds page loads for certain webpages,
when I set network.dns.disableIPv6 to true most pages loads with 1-3
seconds.
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Browsers are slow by default due to IPv6 DNS lookups
https://bugs.launchpad.net/bugs/417757
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