Solutions
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dozzy177's post in My P3D v2 runs much worse than FSX... was marked as the answerThanks for all your help. I suspected the video card (HD5670 ATI/Radeon) is to weak, I believe not even 1Gb mem.
As for the CPU, my i5 is mounted on an iMac (used with Windows) and I suspect that the system splits the quad.
So, I'll save P3D for another day, when I change hardware completely. iMac won't let me change anything insside, as you probably know.