Limit the default quality to 720p and 30 fps. 1080p and 60 fps is excessive and wastes bandwidth.
A stream does not require 60FPS playback. Ever. It's a complete waste of bandwidth and should not even be an option. For people like me that have slower internet it makes it impossible to watch a lot of streamers. Many streamers don't even realize that they're streaming at 60 FPS and how it literally DOUBLES the bandwidth requirements but does not give any benefit to the quality of the stream. I wish Twitch would make the default 720p 30 FPS and allow some users to increase to 1080p 30FPS once they reach partner or something. Not only would this decrease the bandwidth Twitch requires for their servers (saving you a BUTTLOAD OF MONEY and allow you to offer transcoding to more users) it would generally make the experience better for all people with slower internet worlwide! I really hope someone considers this seriously because the savings are there and it wouldn't take much to make this happen and it's a win win for everyone!