I see just the same type of very poor performance and have done for a very long time. It is so bad that like "nocturns2" I do my best to avoid Channel 9. This so frustrating, always the blame goes back to the ISP no matter how many times users point out that they can download and play video from other sites without problems.
I note transfer speeds of maybe 25-30% of that from most other sites I use. It would be really good if someone would take ownership of this issue and address it. This issue has to be driving many people away from the site. Especially since the download is also so unreliable, never mind the streaming.