A topic has been created exactly for this kind of report on the Neogaf board, with two users providing video evidence of the slowdowns. Apparently, Fallout 4 PS4 struggles particularly inside buildings, where frame rate can go noticeably below the advertised 30 FPS; things get even worse if the players use the scope to aim or get shot by enemies. The reports also concur that this present issue is impacting gameplay in a significant way, as it makes combat more difficult other than the obvious immersion problem.