The advice Basti at EA is giving is completely incorrect.
The issue is that the game downloads 6gb of data allowing the game to load and the first episode of single player to be played.
A further 38gb of data is then downloaded.
Restarting the PS4 in safe mode and rebuilding the database will do nothing to speed up the rate at which the data is downloading. I think the point has been missed by Basti. The game is downloading incredibly slowly. Not installing incredibly slowly.
IN CONCLUSION THE ADVICE BASTI AT EA HAS PROVIDED IS COMPLETELY INCORRECT
Click options on the Battlefield Hardline icon and select "information" this shows the amount data downloaded in the "download status section"
I have a 10mb connection. The Playstation Network test gives this speed. 1GB of data takes approx 15 minutes on my PC.
The whole game should download in approximately 11 hours.
I am on day 3 of downloading, I am at 24gb/46gb of data!!!! For me this is going to be a 1 WEEK LONG DOWNLOAD!