An emulator will always have a harder time running a game than straight from the hardware; you need SERIOUS power to overcome the "emulation tax". Older systems like an NES are so simple that overcoming that and then some is trivial, but a recent system like the Switch? Not nearly so easy, not to mention all the complex, specific and proprietary rendering and computational methods that can make accurate emulation difficult.

It'll run like 5-10 times worse though.