PS4 players were having major issues with Fallout 4’s Far Harbour. Foggy island which is where the majority of Far Harbor takes place on, runs incredibly terrible on PS4, dropping to as low as 15FPS at times. Bethesda reissued a new version of the DLC, which required gamers to redownload in order to apparently fix the performance.
Digital Foundry have compared the previous version of the update with the newly uploaded version and found that the overall performance has been significantly improved. You can find their comparison below.