Any chance on getting better framerates?

[Nikkis]

Hi! Is there any way I could speed up Dolphin, because right now the FPS in some games is so slow that it is almost unplayable. Good examples are games like Excite Truck (5 FPS) and Super Mario Galaxy 1/2 (22 FPS).

I'm using Dolphin 2.0 (though using other versions does not affect in any way).
Windows XP SP3
AMD Phenom II X4 B50 @ 3410 MHz
Ati Radeon HD 5770