Game cube emulator?

[Haseeb]

I don't play Mario games on the emulator but I think the problem is in your settings.
Follow mine :

Set the full screen resolution to 400x300 , believe me , it isn't that bad resolution , at least gives much more speed.
Select direct3D9 or 11 .
I use Intel HD graphics as adapter because my tablet has no dedicated graphic card.
Internal resolution = windows size (auto)
AA = none
Antistro = 1x
Hacks = skip EFB , Ignore format changes ,
texture cache = fast (max)
external frame buffer = disabled
Other = fast mipmaps , OpenGL texture decoder , Disable fog.

always use audio DS 32000hz

thats all!
Play game in full screen and tell me how much fps do you get now.

I play Resident Evil Remake on it , its a demanding gamecube game. I also don't get full speed but I get 26-27/30 normally and 23/30 in place of zombies. I think its a pretty decent speed.
Mario sunshine should not be a problem
As I've seen your specs , they are double better than my tablet , it should handle a lot of GameCube games.
I'm gonna try Mario Sunshine to check the speed and you should try Resident evil Remake to check if its only mario or all games are slow