I don't think the backbone of the Internet cares about this. ISPs get a box with all of Netflix's content in it, so you probably never go out to the Internet t

I don't think the backbone of the Internet cares about this. ISPs get a box with all of Netflix's content in it, so you probably never go out to the Internet to watch something on Netflix. (YouTube also does this, though obviously they don't cache every video in every local ISP's cache, and I believe that Apple has a system like this as well.) If there is any slowdown, it is likely due to limitations in the last mile. Netflix isn't sending 4k video streams from California to everyone else in the world individually, assuming everything is working.