Mayor "lagging" in flight gear..

Hey people!I've just installed and wanted to try out this nice simulator. Are experiencing mayor problems though :( I have a fairly powerful computer (specs below) and the ingame FPS dispay says that i'm running 300+ FPS (seams kindof strange). Still, the game is "lagging" me to death, it feels like i'm running with less then 10 FPS!Anyway, posting my specs below, and some veteran might be able to figure out what i'm doing wrong :)Intel Pentium 4 3.20GHz (2 CPUs)1024MB RAMRADEON X850 XT (Driver Version: ati2dvag.dll 6.14.0010.6497)