There's ordinary speedrunning — spectacular though it can be — and then there's this guy, Karl Jobst, who is playing three Nintendo 64 classics at the same time and beating them all in under an hour.
That's Jobst, above, playing GoldenEye 007, Super Mario 64, and The Legend of Zelda: Ocarina of time on three standard Nintendo 64 consoles using regular controllers and no cheats. Jobst isn't General Grievous or anything so he can only play one game at a time, but what he does is blast through one while the others are in cutscenes or other interstitial moments.
Jobst snips the finish line in 51 minutes flat, getting Ocarina of Time and Super Mario 64 right to the point of completion while he tackles the last stage of Goldeneye. Then he hits a couple of buttons in the other two games and everything finishes nearly simultaneously. Masterful stuff.