everytime you type url in the bowser address bar the browser look up for numerical IP, this happen everytime you visit new website.

usually Your ISP has DNS server doing this when you visit any website but this isn’t the best setting

here comes OpenDNS to helps you navigate the Internet in a safer, faster, smarter and more reliable way. and it’s completely free

All you have to do is change the DNS server. either in your system setting, or in your router

What OpenDNS doing to make surfing internet faster is

1-OpenDNS has big and smart cash so it cash every website users vists so when you visit website it doesn’t look up for it’s ip because it’s already cashed
2-OpenDNS runs a high-performance network which is geographically distributed so it responds the DNS quesr from the nearest location that makes it faster

so how do you change the DNS Setting in your system or your router, all you have to do is change your DNS setting in either in your system or in your router to

208.67.222.222
208.67.220.220

more details.