This parameter allows you to choose whether objects should be
rendered anti-aliased or not.
When objects are rendered, lines and polygons may be drawn
either normally or anti-aliased. Drawn normally, a line or polygon
may appear 'jaggy' along its diagonal edges. Drawn anti-aliased the
line or polygon will be blurred at the edges so that they appear
smooth. Images also may be drawn anti-aliased. For example, a
highly detailed image may be rendered into a space occupying fewer
pixels than the original image. If drawn anti-aliased, the image is
sampled at a higher resolution and a filter is applied to compute
an 'average' color for the destination pixel. However anti-aliased
rendering uses extra memory and places a heavier load on the server
so you may wish to disable it using this parameter.