Earlier quoted context omitted.
I believe there is something more nuanced going on with Chromecast "casting" performance. Netflix is fast obviously because you are just telling the chromecast to stream netflix itself, not "casting" it to chromecast. Same goes with youtube. However "casting" performance for me is even worse than the described .3fps on my Chromebook Pixel that isn't running ChromeOS. And my LAN is fast enough to use mplayer over ssh/…
I find the critique confusing, too, because I streamed a 1080p movie to my Chromecast by dragging it into Chrome and then casting from Chrome itself. No problems. It played fine.
Maybe I'll try that myself later.