DNS (or Domain Name Servers) can speed up internet connection if a reliable and fast DNS is configured in the settings. If performed correctly and with the correct DNS people can surf internet with higher speed.
First of all I will like to make it clear what a DNS or Domain Name Server is, it is ultimately a structure to alter domain names into IP addresses.
For those who depend on a broadband connection, the ISPs or Internet Service Providers deliver their users a default DNS server IPs, which are lot untrustworthy and unhurried. For those people or for other who want to speed up there internet connection by the use of DNS there are many healthier, quicker, more safer and more dependable public DNS servers for run-of-the-mill use. Here I am listing all of such reckless & unrestricted public DNS servers along with their IPs.
5 Free and finest Public DNS Servers
The best one I suggest you using is the open DNS. I also use it to get supplementary speed.