Namebench, an amazing software created by By Thomas Strömberg,google employee.
Namebench is a new open source tool that helps to take the guess-work out of the DNS server selection process. namebench benchmarks available DNS services and provides a personalized comparison to show you which name servers perform the best
It hunts down the fastest DNS servers available for your computer to use. namebench runs a fair and thorough benchmark using your web browser history, tcpdump output, or standardized datasets in order to provide an individualized recommendation. namebench is completely free and does not modify your system in any way. This project began as a 20% project at Google.
Here is the download link
namebench-1.3.1-Windows.exe - namebench - namebench 1.3 for Windows (portable executable) - Project Hosting on Google Code
After installing click start and it will take about 10-15 mins approx to do a series of tests and then display a page where it shows the comparison of your current dns server and the best dns server
This is how the results look like
Note:There are other softwares too for this but i found Namebench and DNS bench(another app) interesting and accurate



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). Then there is the go-faster-stripes mentality: I changed to open-dns and my system runs 100 times faster... Oh, right; of course it does