I gave up on televisions about 10 years ago, they were all slow as molasses in January, underpowered, with atrocious interfaces. Nothing fluid or positive about any of them. I've got a 30 inch iMac in the bedroom that we watch everything on, much better than a television. I would be interested in purchasing a 52 inch iMac, hang on the wall, has all the media sharing and everything that televisions fail so much at.
Buy a Roku TV, never connect it to the internet, set it to come on on the HDMI channel your AppleTV is connected to and you get a fast fluid user experience.