Tests and questions in Dolphin

[Willysonicteam]

I have the emulator one weekend,and i tested diferent games.
I ve centred in two games,the Super Mario Galaxy and Wario the Shake Dimension.
I have a intel q6600 to 2,4Ghz and i tested this emulator in this speed the two games.This is the results.(the emulator is limited) DSP "enabled other audio,activated".
The game Super Mario Galaxy:
The video work to 50fps stables,and gameplay 40-35fps.
Wario the Shake Dimension:
The video work to 38-33fps,and gameplay 50-48fps.
I have a good CPU,tested the games in 3,6ghz.
The game Super Mario Galaxy:
The video work to 50fps stables,and gameplay 50-47fps.
Wario the Shake Dimension:
50fps stables to video,and 50-48fps to play the game.To tested,deselected the DSP "other audio",some results:
50fps stables to video and 50-48fps to play the game.
My two questions:
-The Mario Galaxy works good,in a good speed to CPU.OK.
-The Wario Shake Dimension no improve the Fps in a good CPU,only the video improve.Why?
The mario Galaxy need optimize?for eat less CPU?
Thanks.