I've had the game since it was released, and so far it's only about 50% installed. When I downloaded the 4MB, it was done pretty quickly. Now, the rest of the download is taking an abnormal amount of time to complete. I've never had any problems with other preorders- it just seems to be this game. Any suggestions on making the game install quicker?

Are you downloading it online or is it just the game installation?

Game installation. I forgot to mention, I'm doing this on the PS4

If you play it while it's installing, it takes longer. At least in the Xbox it does. Mine took maybe 30 minutes.