The performance is definitely improved on PS4 but still there's a lot a small issues that are a little baffling after so many patches.
- sometimes the performance drops without apparent reason, dialogues become a slideshow. Reloading fixes this for the most part
-fool's gold for me is broken, the first fight has the npcs standing still with 0 health
-pinning a formula doesn't highlight the ingredients anymore
- especially in novigrad the minimap sometimes becomes black and takes a lot to load. Connected to this, sometimes interior maps simply won't load, you can only see quest markers. Reloading fixes that as well
- the inventory lags a lot, selling some stuff and reloading helps but it can become terrible to navigate
Nothing game breaking until now but the game came out in may...they should really iron out some of this stuff