I am seeing a drop in performance on the task thread regarding player events firing, but nothing regarding playback. With the exception that some content starts and I can hear the audio for about a second before I see the video (low end devices only).
I'm having the same issue on a Streaming Stick. The player is choosing a bitrate that is higher than the device can process. I can't find anything in the docs to set an upper bound. I'm amazed the firmware isn't handling this itself.