driver-manager: 20-second delay between entering password and window displaying, with no user feedback during the delay

On my system, after selecting Driver Manager from the menu and entering my password, there is a 20-second delay between the time that the password dialogue box hides and the Driver Manager window appears.

This gave me the initial impression that the operation failed (e.g. a bad password was entered, or no window is supposed to appear).

Looking at the source for mintDrivers.py, the reason for this delay is not obvious to me; I see the code as trying to show the main window as soon as it starts. Otherwise, I would suggest some sort of intermediate "please wait" window as a possible solution.

$ dpkg -s mintdrivers | grep Version:
Version: 1.1.4

$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 17 Qiana
Release: 17
Codename: qiana