Cemu

Steps to reproduce:

• Use gamecube USB adapter
• set up gamecube api and select any controller to configure. Start Super Mario 3D World - even in the intro, the frames drops and the game is stuttering Ingame it's easy to reproduce e.g. in the first 2 levels while using the tubes - if you using 2 players, while one got e.g. a xbox controller and the second is on the gamecube api, the game will stutter when the user with the gamecube controller will use the tube. (Maybe there is an rumble event on it, which can't translate correctly throught the adapter/api so the game stutters)

PS:
Same configuration was tested on other games like mario kart 8 -> this game runs fine with the configuration BUT if you select a wii u pro controller and map this to the gamecube controller, mario kart 8 also stutters and got fps drops on this API, while selecting a wii u classic pro controller mapped to the gamecube controller works flawless perfect.

(All other types of controllers works perfectly on each game, it seems like there is a gamecube controller API problem with this game?)