ExtraDNS accelerates your Internet connection by caching DNS
requests.
Whenever you access a page on the world wide web, fetch your E-mail,
request a file via FTP or access any other resource on
the Internet, your computer will have to find out the IP number that corresponds to
the address of the site you want to access. Each request needs to be
sent to your DNS server across your Internet link. Depending on the
speed of your connection, other line activity and DNS server load it
may take several seconds before a reply is being received. It is but
after this reply that your application can actually start loading the
requested data. When a web page is being loaded, DNS requests need to
be sent for each additional screen element that are part of the page
(images, banners etc.) .

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Extra DNS