Super Mario Bros Wii Slow Motion on Dolphin

[Adahyl]

I'm having problems with the Super Mario Bros Wii.

I begin playing the game with 60fps, then it goes down to 30fps and the game goes in slow motion, that it goes up to 60fps again and keeps on going down and up.
I tested and sometimes I finish the first phase all in 60fps, sometimes only in the end it goes to 30fps and sometimes in the begin of the phase it goes down to 30fps but goes up to 60fps after some time.

I tried to change to opengl, directx9, directx11, checking everybox on graphic config and uncheck results in the same fps.

My notebook is a Y570 lenovo
Intel Core i7-2670QM 2.20Ghz up 3.1 with turbo boost
8GB Ram
Win 7 64bits
GeForce 555GT 1GB

The dolphin version is 3.5-367

[Adahyl]

Now im thinking its not a game problem, im having the same problem with mario kart, but i didnt have this problem with dragonball tenkaichi 3