"Digital games are hosted on Sony’s PlayStation Network servers, which control the maximum bandwidth — that is the transfer rates of the downloads themselves — capping your download speeds by default. So in essence your speed does come into play, but it can’t top the designated cap set by Sony’s servers.
In my experience the PlayStation Network is quite bad. The downloads have taken needlessly long -- Wolfenstein, for example, took most of a day and a night to complete — and it’s something that will vary from person-to-person, but all-in-all Sony doesn’t have a very optimized network environment."
The Problem With Digital Downloads On Xbox One And PS4