Roverlike

Ok, I understand what you say regarding slowness of your drivers door. However, since this might be well measured by multimeter, I would be inclined to test at door lock connector (the one you can get to when you remove door card) if movements at door lock are really at door lock itself that slow, or slowness results because of something else along the lines.
If you are good with multimeter, and willing to try I can provide you info what to measure on the connector. This is another option to be sure where real problem is.