I had the same problem with my 2011 Samsung Smart TV. It had an app for Amazon's Prime Video. Amazon eventually abandoned it and sent me part-credit for a Fire

I had the same problem with my 2011 Samsung Smart TV. It had an app for Amazon's Prime Video. Amazon eventually abandoned it and sent me part-credit for a Fire TV stick. I also have a Chromecast and am generally positive about it, however it's very laggy to controller (i.e. app) input. For example, here's a feature I see as pretty basic for a "smart" display: select a bunch of photos from my phone, beam them to my TV, and flick through them using the phone. All the Chromecast-enabled slideshow apps I've tried for this have been laggy and disappointing, unfortunately.