Curve fineness adjusts the length of line segments for displaying curves. The smaller the line segments, the smoother the curve appears.
With small Curve Fineness values, more data is processed so the graphical performance slows down. If you increase the fineness value, graphical performance is improved but the display quality suffers, producing jagged, more notched curve representations.
Because it is easy to modify this value, you can use different settings at different stages of development.