From TorrentFreak:
"Over the past weeks more and more Comcast users started to notice that their BitTorrent transfers were cut off. Most users report a significant decrease in download speeds, and even worse, they are unable to seed their downloads. A nightmare for people who want to keep up a positive ratio at private trackers and for the speed of BitTorrent transfers in general."
Here is the URL to read the entire article:
http://torrentfreak.com/comcast-thro...ng-impossible/