Serious Lag on OSX

Hey guys,

I need help optimizing dolphin to run my gamecube games properly.

I can't get dolphin to run smoothly on my iMac. Even after optimizing settings with the websites suggestions, there is serious lag in audio and frame rate. It has made running any and all gamecube games nearly unplayable. I'm wondering if there are specific settings I should be using that differ from the PC platform of Dolphin.

Here are my system specs:

iMac (Late 2012)

Graphics Card: NVIDIA GeForce GTX 675MX
Processor: 3.2 GHz Intel Core i5
Memory: 32GB 1600 MHz DDR3

Thanks so much in advance, and I apologize if this is a question that gets asked frequently.