Thx Spiky,
i first installed CF with the Shader just activated (Motion Blur+Bump Mapping not specific selected), but Shift+F12 didn't help. Than i reinstalled everything and deactivated the advanced shader and it seems to run without lags, but enhancements (AA, VSync etc) for Freelancer in the Nvidia graphic panel seem to stay unrecognized.
Will check the whole stuff when i got more time... at the moment i stay with my old Desktop-Computer. On that one, Crossfire runs smoothly.