Video demonstrates the marvel of CRT displays at 380,000 frames per second

When the capture frame rate hits 380,000 frames per second while recording Super Mario Bros. playing on an NES and a CRT TV, the video shows the image drawing not just vertically, one scan line at a time, but one pixel at a time as it builds out each scanline from left to right. It all happens so quickly that the naked eye can’t tell, even on that old hardware.

Source: Video demonstrates the marvel of CRT displays at 380,000 frames per second - Ars Technica

This is pretty amazing to see as someone who grew up around CRT displays.