How the Cemu emulator's devs got Zelda: Breath of the Wild running in just a few hours

[Ljink96]

I'm telling you, there's no way these guys wrote this thing from scratch. Is there? I mean, PS3 and 360 emulators are barely usable, and here we are playing Mario Kart 8 at 4k 60fps, no frame drops. If these guys wrote this thing from the ground up....damn.