8.5. - pv select pen velocity
controls the drawing speed on the pen plotter. The quality of the lines on the plotter depends on the drawing speed and acceleration of the pen. You may sometimes want to draw plots quickly, at the expense of well-inked lines, or you may want to slow the pen for better quality lines. This command has no effect on graphics filters.
pv velocity or pv -1With no parameters, the current pen velocity is printed and you are prompted for a new value.
The numeric velocity parameter you select is sent literally to the pen plotter. Positive values give the drawing speed in centimeters per second. A negative value generally selects the maximum velocity of the pen plotter, but at higher pen acceleration. The default value for pen velocity is 10 centimeters per second.