Which had the following effects:
Can't play Dota 2 anymore due to lag/spikes and well... sucks.
BUT what also happened is, that Twitch became nearly unwatchable, it buffers or comepletly shuts down every 1-5 minutes. No matter the stream quality setting.
Strangely, all other players like the MLG-Player, Youtube and even Dailymotion still worked perfectly fine.
Now why was that? I still don't know, it seemed like Twitch would just stop sending me Data (i have absolutely 0 clue about networking and all that stuff).
How did i solve it?
I now just start some other stream on some other service and mute it... As long as the other stream runs, Twitch works like a charm on every setting.
Well.. I tought this could might help someone else so i wanted to share it.