It isn’t a speed run, nor is it s perfect run with no lives lost. The Super Mario playthrough you see below is a four-game simultaneous playthrough video. Youtube user agwawaf decided to compile a playthrough video featuring Super Mario Bros., Sumer Mario Bros. 2, Super Mario Bros. 3, and Super Mario Bros. The Lost Levels, all being played at the same time.
Check out the video below, but try to keep your focus. It could drive you crazy.