Help running Super Mario Sunshine well

[Nook]

I noticed that the Super Mario Sunshine thread was closed, and the redirected thread no longer exists. I would like to know if I can run SMS at 100% on this computer, specs will be included. I can run it at 100% consistently at the airstrip, and though it shouldn't be much different I'm confused as to why when I am anywhere but the airstrip it runs consistently at 60-70%. If I had to guess I would say that Delfino and all the stages are larger, but again it should not have that effect. Thank you in advance for any help!

Operating System:Windows 8 x64Processor/CPU:AMD A8-4500M APU with Radeon™ HD Graphics 1.90 GHzVideo Card/GPU:AMD Radeon HD 7640GMemory/RAM:6.00 GBDolphin Revision Currently Using:3.5-107

[DefenderX]

Your CPU is too slow, sorry.

The game won't run at full speed

[Shonumi]

For future reference, the new SMS game thread can be found here: http://forums.dolphin-emu.org/Thread-gc-super-mario-sunshine--25937