Fixing Firefox Slowness with localhost on Vista
Firefox takes several seconds to load a single page when using localhost URLs on Windows Vista.
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.
With Internet Explorer it is a registry tweak.
REGEDIT4
[HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip6\\Parameters]
\"DisabledComponents\"=dword:00000001
Fixing Slowness with localhost on Vista
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