Most of the time, slow unreliable Twitch streams are a result of a bad internet connection. Even when you are on WiFi, your Internet connection may still be too slow to get the full benefit of streaming Twitch videos and live action game-play.
The problem is that your computer or mobile device isn’t taking full advantage of its capabilities. Your device sends all the data through either the wifi or the cell signal. If there is any fluctuation or loss of signal, your device cannot receive the data packets it requested from the Twitch server. Instead, all you see is blocky images or endless buffering.