Super Mario Sunshine running slow

[Jao45]

On my PC, this game runs kinda slow when PLAYING, but when on the cutscenes, it works nice!
Does anybody know what is the problem?
I am using Dolphin SVN 6923

My PC:
Windows XP

Dual CPU
E220 @2.20GHz
1,99GB of RAM

Here are my Dolphin settings:
http://img822.imageshack.us/img822/148/imagemnna.png
http://img3.imageshack.us/img3/228/imagem2oh.png
http://img695.imageshack.us/img695/7987/imagem3hz.png

Oh BTW, the newer versions of dolphin don't have the "Optimize Quantizers" option do they?