[«SmG» Cloud]

Rest mode does not help it download faster. If you are playing a game while downloading that will make it go slower just because your console is actively downloading something and trying to play a game at the same time. Also the factors that come into play when downloading are:

internet speed (download)
size of the download
network throttling

PSN, Steam, and Xbox Live all use throttling so that a vast number of users can all download at the same time. My internet is 1 GBit and most of the time I am waiting on Xbox live servers.