[quote=102052]Oh that’s interesting, thanks! So would it be better to have the TV upscale or to have it render and output at the resolution I want?

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Render and output resolution should be set to your tv’s native resolution. By default, retroarch is set to render at 640×480 and output at your monitor’s native resolution, so all you need to edit is “retroarch render resolution” which should be set to “use video output”

If you set your TV to render at a different resolution than its native resolution, this too will cause input lag and artifacts.