Slow internet with 2008 DNS

I installed a completely new Windows 2008 domain with a main + child setup, and DNS. Everything is working great except the internet. The pages come up but its soooo slow to load the pages. I need to refresh the page 3 or 4 time to load completely. I checked with ISP and all speeds are above normal. I can connect a pc directly to the router or network without the domain + DNS and it is working fine. Whenever I put the internal DNS it is slow and "page cannot be displayed". Since I need the AD for the network, I cannot change my DNS also.
What could be causing this? Any possible solutions.
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wamanmaConnect With a Mentor Commented:
In this case, you can add additional DNS address along with your DNS address. This can be achieved by adding and (public DNS provided by Google) in Internet Protocal properties Advanced -> DNS seting.

Post here your ip settings (ipconfig /all) from dns server and workstation.

Please check the TCP/IP settings on windows server.

Then check the DNS server's forward & reverse lookup zone.Check with nslookup command.

Please also check the DNS forwarders.

Open DNS server - right click on DNS server - properties - forwarders.

Tushar Kaskhedikar    
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