With a normal computer (which means 2,5ghz 1gb ram and 6xxx gc) not below 1-2 Frames per sec!
Sometimes if you dynarec is activatet with tick modifer 2 you can get in the menu about max. 30 Fps!
With my "unnormal

) computer i get even 15-25 Fps with luck!
But...
Dolphin is fast enough !
It only needs more stable to get perfect nothing more!
Then In 1-2 years we can play Gamecube games on pc!