Some people seem to take a long time no matter what. You learn to time yourself so that you are ready when they are.
When I was in high school, I absolutely loved football practice. After my last class of the day I would fairly sprint down the hall, and I would always be one of the first in the locker room. I would dress as fast as I could, but when I left to get to the practice field, I would invariably be one of the last out the door. I have no idea why it took me that long. In scuba, I have retained much of that same trait. When I am doing a boat dive, I start the gearing up process as soon as I can, knowing that it will take me that much longer than everyone else. When I do the shore diving associated with local diving, I have to push myself the same way--and I'm usually acting as an instructor. I have no idea what my problem is--I know how to don the gear as well as anyone, but it takes me a while. It's been that way all my life, and I'm not optimistic about raprid changes in the future.