I live in South Africa. I can stream 1080p from YouTube with no issues, but Twitch is usually one of two outcomes: stuttering/lag across all browsers or, since the auto quality feature has been implemented, jumping between 720p and 144p, constantly adjusting quality.

Occasionally I can watch 720p just fine, but this is rare. I've resorted to watching tournaments like TI on YouTube, with the Twitch chat popped out for extra entertainment.