Now for some of my cows

/dev/dns-lookup-delay-in-firefox   thoughts, notes and mooo...

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Thu, 05 Oct 2006 DNS lookup delay in Firefox   >>

I consider myself lucky to have a job where I can use my prefered OS and browser. Actually, all people at the institute are strongly urged to use Firefox, so that's cool I'd say!

Anyway, for some reason page loading in my Firefox on Linux was way slower than page loading in Firefox on Windows. Even on Windows running in a VMWare session on my Linux box page loaded more quickly... It turned out to be that the DNS lookups were somehow slow (I mean, with a direct Surfnet uplink, bandwidth should not be problem, right :).

First I thought our the DNS server was to blame, but we couldn't find a plausible explanation. Then, some more Googling hinted toward IPv6 support to be to blame.

Most of the suggestions I found were related to disabling IPv6 support on a kernel module level, but I also found a hint where in the Firefox configuration you can disbale IPv6 DNS lookups.

So I tried that first by setting the following key/value:

network.dns.disableIPv6   user set   boolean   true

And lo and behold, I think that did the trick already!