I've found the two rPi units that I have hooked up to TVs to work ok, but be frustratingly slow. My typical annoyance is waking them from "sleep" or whatever. I leave mine on all the time and when I turn the TV on, the screen is dimmed and a keypress will bring it back up, but it's generally a few minutes before everything seems to work again. There's generally a decent chunk of time, perhaps a minute, where it's completely unresponsive. Perhaps I could go through some settings to see if there's stuff that can be turned off.