Lower Stream Quality as a Viewer

I love watching my friends play games or watch things, but sometines I don't have the best internet or I'm doing 5 things at once on my PC. I'd really like a feature to lower the resolution and frame rate of streams! Although as a viewer we can't increase the quality, but if someone wants to watch it at a smaller scale to lower the cpu/gpu usage like I do, the ability to lower the quality [other than resizing the “Pop Out” feature] would be awesome! :))
 

Thank you!

TLDR: viewer ended feature to reduce an incoming stream's resolution and framerate.