I've tried playing Donkey Kong Country Returns on various builds and it maxes out at about 50% game speed. Is there any known reason why this would happen? I've tried adjusting settings to the recommended and it doesn't seem to help.
AMD Athlon 64 X2 6000+ (3.0ghz)
2GB RAM
Radeon HD 3800
Windows 7 x64
2GB RAM
Radeon HD 3800
Windows 7 x64