There seems to be an issue with D-Link brand routers and RoadRunner Cable internet. Email works fine, but internet is slow is the issue reported. I have had 6 clients in the Kula, Haiku area with this problem. This issue seems to be around DNS numbers. By manually entering the DNS numbers into your Network settings on each computer both PC and Mac seems to resolve the issue. The DNS numbers entered are as follows:

24.25.227.55
24.25.227.56

Aloha, Rick

Have you heard of OpenDNS?

http://opendns.com

Use these numbers as your DNS settings:
208.67.222.222 and 208.67.220.220

I have been using the for quite a while now with everyone and they are much better.
Go to their website and you will see the advantages of using them.

Larry