PS5 60fps Patch: Nigh-On Perfect Performance:

In conclusion, Horizon Zero Dawn is very much a game renewed by its 60fps upgrade. The 30fps cap is gone, the performance drops that the original release did have are also eliminated, while background streaming is substantially improved in the areas that caused problems back in the day. The timing of the patch is also great - with Horizon Forbidden West arriving next February, there's plenty of time for PS5 owners to play through the original game and the excellent Frozen Wilds DLC. It's a great upgrade that's well worth checking out.
Horizon Zero Dawn's PS5 upgrade delivers a nigh-on flawless 60fps • Eurogamer.net