These days I have a couple Roku Sticks and a pair of Roku TVs, and they handle almost all of my daily streaming. But even after dialing in my setup, including tweaking Roku’s privacy settings to cut down on tracking, one thing still drives me up the wall: buffering. Nothing is more frustrating than sitting down to watch something and seeing that little circle spin again and again.
Source: 10 ways to stop Roku buffering and improve your streaming
