Hm,
yeah thats a typical scenario with not so fast graphic cards, or with ATI graphic cards.
Somehow the game runs slower on ATI cards, than on nvidia.
And it has so damn high requirements, because i didn't programmed it too well, espacially in the "efficent use of ressource" part.
For the next project we decided to use JMonkeyEngine, so that we dont have to programm everything ourselves, espaccialy the graphics part.