Wind waker running very slow, help me!

[Trexiic]

Hi, first of all, I speak french, so my english isn't perfect, but don't worry I'll understand you. (but you might not understand me...)

I know alot about computers and windows, but I don't know alot about emulators. I'm using Dolphin 4.0.2 x64 (the latest I think).
I'm trying to play The legend of Zelda wind waker at full speed, but I can't, so I'm asking you what should I do? (dolphin's configuration, etc...)

My computer's specs:
-Laptop
-A10-4600m 2.30
-7670m 1gb + 7660g
-6gb ram
(If there is anything else you want to know, ask me)

My current settings: http://image.noelshack.com/fichiers/2013/01/1388435223-configuration.jpg

How the game is running: http://image.noelshack.com/fichiers/2013/01/1388435972-11.jpg

Sometimes (1\2) when I launch the game it is running 100%, sometimes 50%, I don't know why... And when it is running 100%, if I minimize it for checking facebook, or anything else, when I come back to the game, it is running 50%...

Thank you!