On my TV (Sony Bravia, from before the Android TV ones), Netflix is terribly slow and occasionally crashes. It used to be smooth and stable, but I don't know who to blame here; the problems could've been caused by Sony, but they could have just as easily been caused by Netflix.

I've learned my lesson, though, and now I just pirate Netflix content I want to see on my TV so I can watch it on Kodi. I'm not planning on replacing my TV any time soon and getting Netflix integration into Kodi is too much of a bother. Unless Netflix comes out with an official Kodi addon, I'll just stick to this setup.

On my AppleTV (the first one supporting Apps) for at least a year it could get horribly laggy when browsing, seemed to get worse and worse until you restarted the app, then it was fine again for a while.

Thankfully it's been fixed for many months now.

It's pretty janky on the older Roku boxes. Mostly due to trying to auto play videos I believe.

I use a PS3 (yes, from 2008) to watch Netflix and it works fine.