Hard FPS drops when changing location (Elden Ring)

FPS sags a lot when changing location or lighting.
Example: in the tunnel in front of the lightning curtain castle, fps is 40-50, but as soon as you go to the castle itself, the fps drops to 15-20. I thought that the drop in FPS is due to the fact that the castle itself has a lot of details and shadows, but no. There are similar drawdowns in a bunch of other places in the Interearth, such as the Academy of Raya Lukaria. There, for example, in one room with huge windows, from which you can see a lot of details at 40 fps, you should go into another, completely closed, but darker, already 20. I found a temporary treatment for the problem - this is re-entering the world. Only in this way FPS is restored, but until the next change of lighting. I tried all the graphics settings, lowered the resolution to HD, but nothing helps. Has anyone experienced this? Is there a way to fix this on my own or wait for a patch?