But, how to find out which DNS service is fastest for you? Here is a free benchmarking tool to determine the performance of local and remote DNS nameservers.
Here is how to use it. Download GRC's Domain Name Speed Benchmark tool. The tool is already comes with OpenDNS and many other different domain name servers. Add your ISP’s DNS and Google DNS (126.96.36.199 and 188.8.131.52) by clicking on ‘Nameservers’ – ‘Add/Remove’ buttons, then click on "Run Benchmark".
After analyzing you will get final benchmark results sorted by nameserver performance (average cached name retrieval speed, fastest to slowest).