When you connect your computer directly to the ethernet port on your cable modem, you get super fast speeds. And in this case, I assume that computer is the ONLY device that can access the signal from your cable modem. But when you add a router to the path, your computer could be sharing access with other devices. And if you are using a wireless connection between your computer and this router, the speeds may not be anywhere near as fast as the direct connection of the computer to the cable modem, since most routers typically drop their wireless speeds down (from N to G or even to B) to match the LOWEST speed of any device connected to the router.
So, you might try testing the upload and download speeds of a computer connected to this added router by visiting such sites as www.bandwidthplace.com
And also check your routers tables to see if any other devices are hooking up to your router and stealing all the bandwidth.
But I suspect that the problem is something in the default setup conditions of the router that is throttling the throughput so drastically -- perhaps a check with the forums at placeshiftingenthusiasts (where perhaps more of the true computer networking experts hang out) might provide a solution.
chakkarinen. Thanks for your reply.
Sling is the only service affected when connecting through the router. I get excellent download speeds on all wireless devices. In any case, I've eliminated wireless connectivity problems by testing using a wired connection only.
I'll take a look at the forum you suggested.