“Motion smoothing” - and thank the gods you can turn that off! I don’t actually have a TV, using a spare 24" monitor in our living room connected to a Roku more than meets our needs. After seeing that feature on most modern TVs has not encouraged me to change our setup. (I only recently learned it’s a setting on the TVs and not inherent quality to the videos themselves.)
Of course I was also amused to learn I’m not the only one who sees that video quality and immediately thinks of 80’s era soap opera camera work! I got through about 20 seconds of this video; I just can’t watch that.