I have an office with 15 or so with XP Pro (32 bit) and Windows 7 Pro (64 bit) workstations on a domain.
I have a Ricoh Aficio MP C6000 multifunction printer with stapler.
When I send a 48 page booklet, PDF, 2MB, color, (11x17, folded, stapled) to the printer with an XP machine, no problem. With the Windows 7 workstations, printing is very slow, with many "waiting for print data" status messages on the printer display. On a good machine, it prints in maybe four minutes. On a Windows 7 machine, around 15.
I've tried the Ricoh universal print driver, along with various PCL5c and PCL6 64 bit drivers for that specific printer. No luck. I've tried printing the PDF as an image - didn't work.