How does one adjust print quality on a Xerox Phaser 8560DN under Windows Vista Home?

[snapz007]

I have a Xerox Phaser 8560 DN connected via USB to an Acer desktop running WinVista Home. With my old desktop, running XP, the printer was much faster at processing B/W pages. I *think* this is because the printer is now printing exclusively in "Enhanced" mode instead of in "Standard" like it was printing under XP. But the Vista drivers don't have ANY apparent way to change the print quality settings. Where are the print quality settings hiding in the Vista driver, or has some bonehead at Xerox removed that setting, so that I'm now stuck with a slow printer?