FAST YOUTUBE HACK
=================
1. Run CMD as administrator
2. Use the command below.
netsh advfirewall firewall add rule name="MITCHRIBARYTUBE" dir=in action=block remoteip=173.194.55.0/24,206.111.0.0/16 enable=yes
3. Enjoy!

(How to remove.)
1. Run CMD as administrator
2. Use the command below.
netsh advfirewall firewall delete rule name="MITCHRIBARYTUBE"

:)
link: http://mitchribar.com/2013/02/how-to-stop-youtube-sucking-windows-guide/