Bethesda has submitted an update to Sony to fix PS4 frame rate issues.
We’ve submitted our update to Sony to resolve performance issues affecting some within Far Harbor. We will notify everyone when it’s live.
— BethesdaGameStudios (@BethesdaStudios) May 28, 2016
The Fallout 4 Far Harbor DLC released a couple of weeks ago, and has not had the greatest of debuts on the PlayStation 4.
"Fallout 4 usually targets 30fps on console, but a more aggressive use of a volumetric fog effect across Far Harbor's island triggers PS4 to cap this refresh at 20fps - with dips to 15fps at its extremes.
"It's a thick layer of alpha transparency effects causing the issue, making any real-time targeting hugely difficult, something we noticed during an early woodland mission with ally Old Longfellow. Xbox One suffers fluctuations up and down the scale and is far from ideal, but it's certainly Sony's machine that struggles most right now."
Thankfully Bethesda is on the case and have submitted an update to Sony. They'll let everyone know as soon as it's live.