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Came across this guy a week or two ago. He does speed runs on a ton of games.

Most of these are NES games but I'm pretty impressed. I should note he seems to cheat somewhat by finding glitches in the game that warp him a couple screens over or something.
I've come across this guy in some of Summoning Salt's 'history of *insert game title here* speedruns.' Even if you're not into speed running, the videos are interesting, seeing the dedication these guys put into shaving off fractions of seconds for world records is pretty crazy. Not to mention the glitches that get discovered then the race to reliably perform and implement them. Worth a look.