Dolphin is slow on mid range pc

[nick8195]

My Specs Are,
AMD Phenom X4 9950 BE @2.66GHZ
9800GT 1GB
2 GB Of Ram
Windows 7 64Bit

My Settings Are,

Configuration
Dual Core
Idle Skipping
Enable Cheats
Frame Limit Auto
HLE the IPL
Jit Recompiler
Use Panic Handlers

Graphics (Direct3D9)
Full Screen
Force 4:3 Standard
Full Screen Resolution 1280x1024
Windowed Resolution 640x480
Safe Texture Cache OFF
Enable CPU-EFB Access OFF
EFB Scaled Copy
EFB Copy To Texture

Sound (DSP-HLE)
Enable HLE Audio
Enable DTK Music
Enable Audio Throttle
Enable RE0 Hack OFF
Audio Backend - DSound

I am able to run games such as New Super Mario Bros.Perfectly. To name a few Donkey Kong Jungle Beat, Muramasa The Demon Blade, And New Super Mario Bros.

However when trying to run a game such as Sonic and the Black Knight My FPS is only about 10-20 The same goes for No More Heroes 2: Desperate Struggle And The Conduit.
I have the speedhacks enabled for both games and changing the resolution has no impact on speed at all.

Do I have something wrong with my Settings? Why is it going slow?

[cmccmc]

because dolphin only uses two cores and your pc only runs at 2.66ghz it's going to be slow

[Diddy Kong]

There is nothing wrong with your pc, the emulator is under development, and you call that mid range?

[nosound97]

For games that use speedhacks you gotta disable "Other Audio" in DSP settings