Graphic Problem: Zelda Wind Waker in MAC

[Sergitron]

Hi, I have a gambling problem in Zelda Wind Waker, runs at about 25 fps on average, use a MacBook 13 "and the version 3.0 of Dolphin, and the main problem is that the shadow on the face of Link and the characters are not well, I tried to change graphics options but I can not fix it.
I put a screenshot so you can see clearly that I speak.

thanks