I had my plot server shut down for my wide format plotter. I was just plotting to PDF. The initial dialog box was looking for the wide format plotter. I had no present use for the wide format. It took 3 hours to plot about 8 11X17 PDFs.
I booted the plotserver back up and it started running fine again. Switch the Printer/Plotter > "Name:" value to PDF.
....and it's fast like a glare ice on a steep hill.
Hope this helps someone.
Windows 7 Pro SP1, HP Z400 w/Dual ZR24w Monitors, 12G Ram, AutoCAD MEP 2012