It hasn't been an issue in my experience. rtings.com rates input lag on tvs (as well as how well they work as monitors).
Most modern units have game mode and/or PC mode which I assume disables some processing to drive down lag. On my LG C2 OLED, changing the input type to "PC" results in a visible flicker (just one flicker) when the display is shifting into some new mode.
Most modern units have game mode and/or PC mode which I assume disables some processing to drive down lag. On my LG C2 OLED, changing the input type to "PC" results in a visible flicker (just one flicker) when the display is shifting into some new mode.