Tons of people use YouTube just to listen to music. And, in many cases, their browser defaults to a high bitrate video, which is totally wasted bandwidth if they've switched tabs away from the video (back to their work, etc).
Would it be feasible for YouTube to deactivate video (or at least downgrade the quality) when the browser tab is inactive?
It seems like, if feasible, this optimization would have the potential of significantly reducing traffic.
Does it already do something like this?