I just left Comcast a month ago over this exact same throttling issue. During prime time I couldn't get HD streams despite a solid 60 Mbps down. All other services like Hulu and Amazon worked perfectly still. When I used a VPN to encrypt my traffic though, Netflix was perfect.
Sep 18, 2007 Remote Desktop Services Latency and Comcast Home Users Mar 13, 2015 Comcast Is Already Throttling Mobile Video Unless
Apr 29, 2020
Bypass ISP Throttling For Speedy Connection - VPNInsights Jul 01, 2020 Bypass Your ISP's Throttling of Netflix or Other Videos
Throttling in "congested" areas | AT&T Community Forums
Comcast is quickly gaining enemies from the BitTorrent crowd by using new technology to throttle torrent downloads. The Associated Press was able to confirm that they are in fact doing this through tests all over the nation. In their report they say that this move is “the most drastic example yet of data discrimination by a U.S. Internet service provider.” How to Get Around Comcast's BitTorrent Crackdown | The Jun 01, 2012 Stop Throttling! How to speed up your internet and avoid May 16, 2014 Hitron CODA 4589 RTMP throttling? - Cogeco | DSLReports Forums Oct 17, 2019