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This is the lag caused by the modern displays/televisions/monitors (due to the nature of the digital technology). [[Wikipedia:Digital_image_processing|<abbr title="Shouldn't be confused with analog image processing.">Digital image processing</abbr>]] (such as upscaling, motion smoothing and edge smoothing etc.) takes time and therefore [https://www.rtings.com/monitor/tests/inputs/input-lag#why-there-s-input-lag adds some degree of input lag]. [[Displays#CRT_TVs|HD CRTs]], LCDs, OLEDs and other digital displays do have digital image processing and cause noticable input lag. Once the digital processing done, the pixels need time to switch to the new frame's colors, which is called '[https://www.rtings.com/monitor/tests/motion/motion-blur-and-response-time pixel response time]' (cause a blur on screen, so it's different from input lag), remember, pixel response affects how fast you see the image update, while input lag impacts how quickly the display reacts to your commands.
Analog [[Display FAQ#CRT TVs|CRT TVs]] and [[Display_FAQ#CRT_monitors|VGA CRT monitors]] and even [[Displays#CRT_TVs|HD CRTs]] have very fast response times but it's limited by [https://old.reddit.com/r/crtgaming/comments/qyx4r3/is_this_normal_for_a_crt_monitor_if_not_is_there/ phosphor decay time] due to the nature of the technology. Similar to CRTs, [[Displays#OLED_Monitors|OLED]] displays have almost no blur on screen due to their very fast response time and also capable of displaying true black levels, which means that they do not require a backlight to produce an image and this allows OLEDs to turn individual pixels on and off much faster than [[Displays#LCD_monitors|LCDs]], which require a backlight to produce an image.
If you're in the market for a monitor or TV; check [[Input_lag#External_Links|these websites]] for input lag and display lag performance of various display products. Some of the modern digital displays only have negligible amount of input lag and display lag and even some of them are near identical performance compared to Analog CRTs.
