Reeaaaaaaaally slow startup

[nirvana]

my default directory is F: which is an archiving drive, and has almost 1600 folders in it. when i change default dir to C:, which is almost empty, it reduces the time but is still slow to load.

when default directory is the one with 1600 directories:
loading time ~10 seconds
when default dir is an empty folder (or close to empty):
loading time ~4-5 seconds

my computer is a good one, too.

also, no shell addons of any sort.