New Vizio TVs use motion equalization to make the content you see look smoother.
What is motion equalization anyway?
Motion equalization works by increasing the frame rate by the content you are watching on the TV. This is done by artificially adding extra frames between each real frame to synchronize the content to the refresh rate on the screen, which sometimes double or quadruple perceived refresh rate and "smoothness" of the image.
But, this does not always look good, and often leads to blurred images and nasty artifacts. In addition, some people do not like higher refresh rates and prefer to disable the option.
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How to turn it off
On Vizio TV, open the setup menu, select "Picture" and then switch to the "Advanced Image" tab. Here you can set different levels for "Smooth Motion Effect", such as adjusting how much interpolation and motion blur is applied. You can completely disable it by setting it to "Off".
On some TVs, you may find the option under Picture Mode> Advanced Video Features.
If you have an older TV with the feature, you may need to contact your TV manual if you cannot find the option that you can find online.