Dan Wahlin discovered why Firefox runs so slowly when connecting to localhost. The Firefox IPv6 localhost bug significantly impacts page load times for the integrated Web servers in Visual Studio 2005 and Visual Studio 2008, as well as local AJAX development. Dan explains the issue and outlines the resolution:
It turns out that the slowness is caused by an IPv6 issue with DNS and can easily be resolved by turning IPv6 support off in Firefox while doing localhost testing. To make the change, type about:config in the address bar, locate the network.dns.disableIPv6 setting and double-click on it to set it to true. This does the trick for the Firefox localhost issue on Vista and everything is running fast again.
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