[Therion] loch performance issues on linux

Hi, I'm using the "Loch" 3D-viewer on Linux. When moving and rotating the picture it flickers much. The autorotation is almost useless, it's so demanding on CPU and memory that it becomes unresponsive after few seconds. Other OpenGL applications like Google Earth work fine. The same lox-file also works fine with Loch on Windows XP. Where is the problem? Any suggestions? OpenGL Information: GeForce 8400 GS NVIDIA Driver Version: 173.14.15 Regards, Thomas