The downloader seems to prioritize based on how much you have to go. Basically, giving more bandwidth to people who are close to done in order to make way for others.
My one computer is getting really high rates (usually around 400 and upwards of 800 at times) and my other computer was getting rates in the double digits, so I just stopped it.
It looks like you can just copy the data files over to a 2nd computer and run the lobby to validate them. I'm just going to do that so I don't take up 2 slots in the queue.
now it's going between 600 and 1100. It definitely looks like it's prioritizing to knock people out of the queue if they're close to being done. Sit tight, we should all have the client by Monday