Recently we started to have slow internet problems i.e. pages not
opening
until after a refresh, pages opening slow.

We have run sniffing tools and found nothing out of the ordinary. What
we
did find was that if we use two internal dns entries i.e. my main
server and
one from another location and a 3rd DNS server from our ISP that web
pages
open much faster. What could be causing this?

thanks