1841 Slow Web Browsing?

I aquired an 1841 recently from work. I am trying to use it as my home router. I have set it up with the very basics (dhcp wan, dhcp pool for lan, nat). It is grabbing an address from Comcast. It works, ran speedtest and the speed looks fine at 25/3 or so.

The problem is when I am surfing the net. I'll go to a site like Youtube. It will take forever to load the site, never play the video. I have tried other sites, Autoblog, Break, etc. It seems like anything with a lot of multimedia. If I go to MSN, the first time it will take about 10 seconds to load all the pictures, after that it is instant (probably cached).

Then, if I wait a few minutes, go back to the same site, sometimes it'll be just as slow, sometimes it'll work fine. I have checked a few of the cisco logs and it doesn't show any drops or errors that I can see. If I run a constant ping to something like google.com while it is slow loading, the response time remains normal around 25ms.

I set up my other d-link home router and it works fine with all sites, same speeds from speedtest. I tried plugging a computer directly into the Cisco and same slowness issues.