Tis the season.
This is a further improved TAS of Summer, a cryptic and difficult Super Mario Bros. 1 ROM hack created by Mana in 2002!
This hack may not be notable for being complex, but it requires a vast amount of skill and will sometimes force players to use glitches against their will.
My newer run beats Zejoant’s run (which also beat my 2021 run by 43 frames) by 84 frames due to, yes, improved optimization still.
Your IPS patch, sir? Better to lay off the heat and enjoy this run while you still can. ;)