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Arsenal of Democracy has huge slowdown in Windows 8, it was very fast in Windows 7. Darkest Hour has slowdown too in Windows 8. It seems that the problem is with the Europa Engine. Is there a solution?
Probably the grahics driver not liking the 16Bit color mode. Please try setting your Windoze desktop to 16Bit colors and run the games in a window - any difference?
What's your graphics card?
I couldn't find to reduce desktop colors from 32bit to 16bit. It seems Windows 8 has not real High Color (16 bit) mode. http://devgurus.amd.com/thread/160222
My GPU is AMD HD6850.