All of the options for per-cell object mode are available and have the same function, except that the only code that is considered for -t is ``c''. By default, subcell checking is not enabled. If enabled (``-t c'' is given), then subcell placements are checked as in per-cell object mode.
When using per-cell geometry mode, the geometry is compared within areas of a grid whose size is given by the PartitionSize variable. Experimenting with this size can lead to improved speed, depending on the layout density. The default partition size is 100 microns. For best performance, this can be increased for low density, or reduced for high density, where ``density'' refers to the number of trapezoids per area.