NxOgre117 (Terrain demo) running very slowly

NxOgre117 (Terrain demo) is running very slowly on my PC (maximum 2 FPS). The other demos work like a charm. Why could this be the case?

It's a known issue.

It's a bug/feature to do with the visualization of the terrain shape.

Thanks for your response. How would one work around this?

You have to disable the flag for visualization for the Terrain shape.