Emulator

Hello, I play the latest version of "Dolphin" to 2.0 (32bit)! and I play
Zelda wind waker (PAL version / Gamecube) and always when I go to places
more open FPS falls far outside that is perfect so do the Zelda TP (NSTC-U
version / gamecube)!
Can someone help me? I use DirectDX9 for both!

my settings:
CPU: Intel Pentium Dual CPU 2.20GHz
2.20GB RAM Win XP Sp3
Nvidia GT8500 and latest version of directx .. I think (as I see which
version is installed, and what's the latest?)

Another thing I would like to know the best settings for the controls of
the wii!
I want to use the mouse and the keyboard!

Thanks so much and please help!
remembering that I am new at this and do not understand very well explain
it then ok?

sorry about my English