Thank you for that. I thought Netflix uses someone else - remember the hoohah about Comcast and the L3 and Tata links and blaming netflix.
It does seem odd Amazon would host Netlfix content. I have a 768K line in a cabin - Netflix streams to the Roku, but Amazon prime stalls and buffers.
I would have thought from that informal observation that Amazon was a different CDN than Amazon - perhaps the Netflix streams are VC1 (I am pretty sure they are since that's the default on the Roku) where Amazon is using a higher bit rate codec?