To state that a DNS server configuration can speed overall net traffic by 80% is simply not correct. The role of the DNS service is to resolve domain names to IP addresses. Once a DNS server returns the IP information that is requested of it the connection to the web server is made and speed relies on network congestion (usually ISP ability to handle traffic load) and the ability of the web server to handle the volume.
The only way that a DNS configuration will improve sustained network traffic is if you are constantly jumping from one domain to another and repeatedly making DNS requests. Even then, you don't know if the request is being forwarded from one DNS server to another. A DNS request is only satisfied by the server if the domain information exists in that server's hosts file. If it isn't the request is forwarded to another DNS server.
It's true that a more responsive DNS server will help create a faster connection to an end server by resolving the name faster but that is where it ends. If you experienced an 80% improvement then you had a terrible DNS server that you were using and probably had to wait a long time to establish initial connections. Most people would not achieve anything close to that.
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"The gadfly has returned! Thou simpering, whining stable dropping. I have defeated thee repeatedly and still thou darest crawl back for more punishment. Chastise thee I shall. Thy stature is insignificant and thy name moronic. Brother to the vole! Offspring of money grubbing know nothings!" ... Spellcraft: Aspects of Valor
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