Cemu, WiiU Emulator, is still in a comparatively early stage of development, but it is already capable of running New Super Mario Bros. U, New Super Luigi U, Super Mario 3D World, Super Mario Maker, Captain Toad Treasure Tracker, Mario Kart 8 and some other WiiU games at full FPS with very little or none visual or sound errors. Cemu has not reached the point to support TAS yet, but seems like it isn't going to take very long.
If you're interested please type "cemu.info" in your browser URL and you can download the newest Cemu (1.5.6b, 1.6.0 will come out in a few days).
Cemu requires at least 4 GB of memory to run.
The speed of your emulation depends on your computer hardware. I'm able to run all the Mario games at 60FPS, this is my hardware
Lenovo Ideapad 7000 Laptop
Processor: Intel Core-i7 6700HQ @2.60-3.30GHz
Graphics Card: NVIDIA GeForce GTX 960
RAM: 8GB
I tried to use Hourglass to run Cemu, but seems like it won't work.
Really looking forward to TASing on Cemu!
(An Old Screenshot with Cemu 1.5.1p)