advanced preference
Smooths out jagged edges to produce a more pleasant image, but at the expense of increasing the graphics processor's workload. The increased workload may, on some computers, cause the animation to become slow and jerky. Recommendation: try Curved Spaces with and without Smooth Edges, and see which you prefer.
Note: Most current graphics cards support Smooth Edges (multisampling), but Intel Integrated Graphics does not. If your graphics processor does not support Smooth Edges, Curved Spaces disables the Smooth Edges menu item.