So I've been having issues streaming lately, mainly on Mixer due to their FTL servers (these are the servers for no delay between video and chat). My upload speed was clearly being throttled when I used the FTL servers. I called Comcast out on it and they obviously won't admit to it and had a tech come out, is saying Uverse is connected to their node and it needs fixed and that's the problem... yet I only have issues on the one set of servers.
Found out another Mixer streamer was having the same issues, to fix it Comcast told him to upgrade to Business Class and then admitted they have what they call "Network Shaping" which detects things like the FTL stuff and throttles said internet, but they won't ever admit to it publically, he only found out through an employee off the record.
I hate this company.