One of the things that slows me down is the photos. I tend to batch them up rather than take the card out of the camera after every item (which I imagine would cause undue wear on the contacts). Then sometimes straight after photographing I store the items immediately in numbered boxes, or sometimes I don't and wait until I list before deciding which box to put them in. Plus the room with the boxes is quite remote from the computer, so I end up trotting back and forth a lot.
It all feels like a very clunky workflow and I'm sure others do better.