now that CF1.7 is running on the new server i was able to compare the data with the data from the CF1.8 test last weekend
noticable is that in idle state the CF1.8 server (with the same settings as the current CF1.7 version) showed a by 40-50% reduced serverload. This data was like i said based on the first beta test and an idle server. The server files were not yet optimized and still contained several bugs which slowed down the results.
even with the beta testers online the server showed better performance than the empty cf1.7 server
however alltogether with the hardware related boost due to the server switch I lost my worries about the future performance of the server and expect that together with some planned memory optimazations the performance boost will even raise so that the server easily should be able to handle high numbers of players.