Ok, this has been buggin me for months an I am finally getting around to doing something about it.
My 300MHz iBook has an Airport card and runs 9.2.2.
When I boot up, it takes just over two full minutes from the time my desktop appears (background and grey strip for the menu) until all icons and such display. during this time, the machine appears to hang and nothing loads to the screen, all screen artifacts load within seconds at the end of the 2+ minute waiting period. I have been able to figure out that when I turn off extensions which tell the laptop I have an AirPort card, I enjoy full boots in about 30 seconds, but no internet ('cuz I need the card for that, so I must reboot and www-aaa-iii-tt ).
So what gives?