Firefox and Chrome slow on localhost; known fix doesn't work on Windows 7

Question

Firefox and Chrome are known to be slow on localhost when IP6 is enabled. In previous versions of Windows, the simplest fix is to comment out this line from the hosts file,

Answer 1

Just Try "Incognito" mode on Chrome and "Private Mode" on Firefox.

I know this not should be a correct answer. But you can use this as a temporary solution.