about DNS speed and configuration on Ubuntu 12.04

Hi,
things have changed from when you have to add nameserver in file /etc/resolv.conf
In case of a static configuration in /etc/network/interfaces is possible to add nameservers right here, with the following syntax

As you can see is possible to define multiple nameservers. I will use Google public DNS for resolution because it run faster than my internet provider DNS server.
If you want to check speed of the nameserver: