This works insanely good. Enjoying a load-free youtube now. 
Here's how it works
You're blocking a tool that's being used to slow down loading streams on Time Warner Cable connections in order to save money. Which violates net neutrality.
Basically you're telling YouTube that it can't find the other lanes to use so it's forcing it establish a direct connection all of the time instead of sourcing parts of the video from different locations.
Now; the guide
1 Click the Start button, type “cmd”, and right click the icon to ‘Run As Administrator’ (Screenshot 1)
2 You will likely see a UAC prompt, hit “Yes” (Screenshot 2)
3 The command prompt window will open, this is where you will type in the commands to set your firewall rules (Screenshot 3)
4 Enter the following command and hit Enter. If it works, you should see a big “OK”.
Screenshot 1
Screenshot 2
Screenshot 3
Source: http://mitchribar.com/2013/02/how-to-stop-youtube-sucking-windows-guide/

Here's how it works
You're blocking a tool that's being used to slow down loading streams on Time Warner Cable connections in order to save money. Which violates net neutrality.
Basically you're telling YouTube that it can't find the other lanes to use so it's forcing it establish a direct connection all of the time instead of sourcing parts of the video from different locations.
Now; the guide
1 Click the Start button, type “cmd”, and right click the icon to ‘Run As Administrator’ (Screenshot 1)
2 You will likely see a UAC prompt, hit “Yes” (Screenshot 2)
3 The command prompt window will open, this is where you will type in the commands to set your firewall rules (Screenshot 3)
4 Enter the following command and hit Enter. If it works, you should see a big “OK”.
Code:
netsh advfirewall firewall add rule name="MAKEYOUTUBEFASTER" dir=in action=block remoteip=173.194.55.0/24,206.111.0.0/16 enable=yes
Screenshot 1

Screenshot 2

Screenshot 3

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