Kenzodielocke
Banned
The emulated version of Breath of the Wild is playable with Cemu, which emulates the Wii U, and it's far from perfect. Initial bugs made parts of the game unplayable, and they're still being worked out (which is pretty much par for the course when it comes to emulation). Still, it's an impressive turnaround.
"I think a lot of [the speed] can be attributed to Xenoblade Chronicles X, which is a similar open-world game that already presented us the same technical challenges early on," Exzap wrote me in a Reddit message.
With the technical glitches worked out from emulating that previous title, Breath of the Wild could quickly be ported into Cemu. But because of Breath of the Wild's complexity, and Cemu's own janky nature—the team describes it as "highly experimental software"—bugs are still being ironed out.
"The goal is to get every game running 100% eventually," Exzap wrote. "How we get there and how long it will take is difficult to answer. But in regards to [Breath of the Wild] I think we will see small incremental improvements in almost every future Cemu release. It's been this way for most other games so far."
"Emulators allow for extra customization that the original console did not offer," Exzap wrote. "For example, using Cemu it will be possible to play [Breath of the Wild] in 4K resolution rather than the 720p enforced by the Wii U."
As for the framerate drops, Exzap said that eventually Breath of the Wild will run smoothly at 30 frames per second, because of "the way [ Breath of the Wild]'s engine works."
Some more at here
Edit: There is a thread on that video already, but it is again.