It looks like modders were able to find the reason for the poor performance of Dragon's Dogma 2

Dragon's Dogma 2 performance issues may be caused by a strange design decision, based on some recent findings by modders.

As reported on the ResetERA forums, the vanilla game has an absurdly large 3D LOD loading radius models (LoD), and everything except grass and some small things is loaded at maximum detail, which is completely pointless considering how large that radius is. Unless the game has lower detail assets, performance is unlikely to improve significantly in future patches. It remains to be seen whether mods will be able to solve this problem in the future.

Dragon's Dogma 2 is already available on PC, PlayStation 5, Xbox Series X and Xbox Series S.