There is no synchronisation issue.
But there is just too much stuff to be done between the initial background 
color and the actual background image is drawn.
There are 2 things that take longer than 0.2 seconds: launching Canberra and 
playing the startup sound takes about 0.26 seconds and LightDM.get_layout () 
(line 81 in menubar.vala) takes about 0.20 seconds.
So there was about a half second gap between those two backgrounds, 
unfotunately a ~0.1 second gap still remains.

The fact that the standard purple image is loaded at all, is a problem caused 
by appending the *other user to the user_list(which is the first user added, so 
the purple image is drawn) and then removing it later(which triggers a 
background redraw of the actual image).
But still, unity-greeter will fade from the initial background color to the 
actual background image, because the fade time is set and i am not able to 
disable it and reset it later. :(
But in my opinion that is no problem, the fade in actually looks nice.

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https://bugs.launchpad.net/bugs/970024

Title:
  Unity Greeter has purple backgroundcolor before the background image
  is loaded

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