Ah yes, my bad. It was specifically (entire Plan9 OS) designed for distributed networks. But still; stuff like Fuse and streaming entire HD movies isn't a problem over the internet, so what are we even talking about?
Rio works mostly with commands and discriptions, which is window management transparent, which means resizing a window isn't even consuming bandwith. I'm guessing this is a pain in X.org?
Should be just fine.