CPU is slow, sorry. And GameCube emulation isn't "simple"; there are some real demanding GC games (for example Mario Sunshine).
You could try to configure each game individually and avoid really CPU-intensive games. I recommend you enable most speed hacks, use HLE audio, no Vsync and set to auto limiter. Follow the wiki for basic instructions per game.
The a vbeam speed back sometimes causes audio in games to speedup (like in F Zero), there's nothing you can do about it to fix the audio - other than disabling the hack (to my knowledge that is). When the whole games speeds up, you could try experimenting with the different limiters; audio, a fixed framerate or auto.
You could try to configure each game individually and avoid really CPU-intensive games. I recommend you enable most speed hacks, use HLE audio, no Vsync and set to auto limiter. Follow the wiki for basic instructions per game.
The a vbeam speed back sometimes causes audio in games to speedup (like in F Zero), there's nothing you can do about it to fix the audio - other than disabling the hack (to my knowledge that is). When the whole games speeds up, you could try experimenting with the different limiters; audio, a fixed framerate or auto.
CPU: Intel 3570k with Corsair H60 watercooler @4.1ghz
GPU: Nvidia Asus GTX780 @1140/6600
PSU: Corsair 750W
RAM: Corsair 8gig DDR3-1600
MOBO: Asrock Z68m ITX
HDD: 500gb SSD EVO
CASE: Lian-Li PC-Q08 mini-ITX case
OS: Windows 7 x64
I use a fully configured emulator frontend (Maximus Arcade) to play every console & arcade game instantly
GPU: Nvidia Asus GTX780 @1140/6600
PSU: Corsair 750W
RAM: Corsair 8gig DDR3-1600
MOBO: Asrock Z68m ITX
HDD: 500gb SSD EVO
CASE: Lian-Li PC-Q08 mini-ITX case
OS: Windows 7 x64
I use a fully configured emulator frontend (Maximus Arcade) to play every console & arcade game instantly