If you have any ideas not listed in the Performance Guide let me know. But some games cause Dolphin to crash on both versions (Avatar - The Last Airbender). Some games like The Sims 2 Pets doesn't run at all in 4.0 but runs fine but at around 83% in 4.0-1478. Other games had a more significant impact, Baldur's Gate Dark Alliance jumped from an unplayable 40% to 100% without any lag. The fact that it speeds up simply by using a different version tells me it might be how Dolphin was programmed. Either way I don't see how it could possibly be the demands of the game slowing Dolphin down, my CPU is running at 2% and I have a couple unused GB of RAM while the game is running. Disabling EFB Copies still makes no difference, I guess its just not something the game uses or the functions broken in the Mac version. I can run very demanding computer games like Diablo 3 at maximum settings but I can't run old GC games? I am using 4.0 (the latest stable version for Mac) But just now I downloaded the latest development version, 4.0-1478 and I noticed the game has jumped from running between 63-73% on average to 73-85% on average and Sims Bustin Out jumped from around 40% to around 55% (jumping between 30-80% periodically, bringing it from unplayable to playable with a great deal of patience in my book) (very short testing with the dev version) and this is with the same settings. I have tried everything in the Performance Guide ( ) I even disabled EFB Copies altogether and everything else to boost speed and the most simple game I have (The Sims 1) still runs at most 70%, the second game in the series The Sims Bustin Out runs around 40%, while The Sims 3 for Wii runs at 100%. Dolphin seems to work perfectly with Wii emulation, they all run at 100%, but for some reason all Gamecube games are significantly slowed down, and despite adjustments to settings the speed is unaffected.

I'd list comp specs but I already did at registration so I'm guessing you can see them.

Sims bustin out iso not working