Firefox very slow on localhost connections on Windows 7

Doing ASP.NET web development on my laptop (Windows 7 Ultimate 64 bits), I was wondering why page rendering was so slow with Firefox 7, when using Visual Studio 2008 and its development web server. Surprisingly, this was not the case with VS2010.

Doing some research I found this blog entry, which was quite helpful.

The change of the Firefox setting network.dns.disableIPv6 to true did the trick.

1. Type about:config in the address bar.
2. Type v6 in the filter field.

See screenshot below: