You can’t get a decent non-smart TV, but you can just not connect a Smart TV to the internet.

Any TV you buy will have a range of “picture quality enhancement” settings. These all introduce some rendering latency. Game modes on TVs (for the most part) bypass the PQE functions. Rtings.com is a quality source for this kind of info. They do good work and publish their testing methodologies.

Source… worked a shitload of years in TV electronics, and was part of the industry from Smart TVs being godawful to just a few years ago.