It took that time before the update for me as well. 1-2 minutes for every loading screen. There was a mod for that (before the next-gen update) that you could not load via nexus, bc the setup was a little more conplex, but it worked really well (see https://www.nexusmods.com/fallout4/mods/10283 )

The method of this mod was to speed up the fps only while in the loading screen to 300-350 bc the loading times were somehow tied to the fps. Well done Bethesda.