Hmm, is this new in 10.3?
I opened Printer Setup Utility to add a printer and it briefly flashed the spinner with a text "Searching for drivers".
I had a number of network printers already setup, so could it have been checking online for updates?
Or merely loading up local files?
I also vaguely recall one HP LaserJet having gained extra options in the print dialog, but that might be psychosomatic.
J