Alright so I have PM running on Dolphin for OS X. Everything works fine. The menus and the intro are almost flawless. However, when I get to the character select screen, the audio starts stuttering badly and the FPS drops to about 30. The lag goes away at the stage select screen but then comes back in matches. I think i've tried all of the Dolphin options to reduce lag, but maybe there's something I don't know? Is there anything I can do to raise the FPS? 
Here are my Mac specs:
OS X Yosemite version 10.10.1
iMac (21.5-inch, Late 2009)
Processor: 3.06 GHz Intel Core 2 Duo
Memory: 8 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce 9400 256 MB
Here are my Mac specs:
OS X Yosemite version 10.10.1
iMac (21.5-inch, Late 2009)
Processor: 3.06 GHz Intel Core 2 Duo
Memory: 8 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce 9400 256 MB