named

[rajiv-FrUbXkNCsVf2fBVCVOL8/A at public.gmane.org (Rajiv Aaron Manglani)]

> do a full look-up every time you visit.  As a result, for infrequently
> used sites, your ISP's DNS servers will very often be faster.  It's
> not completely inconceivable that, if your personal pipe is small and
> busy (just e.g. dial-up), hitting your ISP's DNS servers will take
> much less time than your own DNS server to resolve sites.  Using your

http://code.google.com/p/namebench/ is a useful tool to to test and benchmark various name servers.