Actually, you misinterpreted my post...
Get 2 collections of about the same size, both like 100 mb, as so you will have to wait some time for it to be downloaded.
Start downloading with both collections unpaused. Than after some time (before the first one is finished) pause the 2nd collection, the taskbar will still give the same amount of progress being finished, while the queque size has been cut to half the original size, so the processbar should double in length. (Now it could be that it still updates after 1 file has been downloaded, so that the refresh of the bar comes later, but I haven't tested that).