The game likes to drop FPS to low 20s or in some case even below 20, especially while exploring interiors [e.g corvega factory, or giddy-up hq] and lately I've been having SEVERE frame drops when shooting with combat shotgun, whenever I put 3-4 shots into someone the game is dropping frames like crazy, please, this needs to be addressed, game is effin' awesome, however I can't enjoy the firefights because of all the frame drops, it breaks my immersion every single time it happens.

I'd glady post a video on youtube but unforunately I can't post links :/

I have the same issue in the exact same locations. I also noticed that if you get attacked by a Bloatfly, the particle effect on screen drops the FPS significantly too.

The game lags horribly in central Boston, sometimes my game even freezes on PS4 :/

Seconded.

I use the combat shotgun and sawn off shotgun, and since reaching level 7, my game stutters and the audio crackles/skips when firing it in VATS or out of VATS and performing a critical hit or decapitation.

I also get the same stuttering when entering a new area and the location text appears on the screen.