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

As someone else noted in a different answer - if you have bitdefender, then that will merrily ruin your development experience.

Best to open the bit defender console, enter alt-shift-control-g (which puts it in "game mode") and run from there.

in game mode, bitdefender won't bollocks up your localhost!