FER</dt>

<dd><i>Switch.</i> If this variable is defined, with any non-null value, PGPLOT buffers output. The effect is the same as if <a href="subroutines.html#PGBBUF">PGBBUF</a> is called immediately after opening the graphics device, and <a href="subroutines.html#PGEBUF">PGEBUF</a> immediately before closing it. It will have no effect on programs that already include these calls. On some devices, buffering output can lead to large improvements in speed, but enabling buffering may upset synchronization be