Update: I think I figured out the cause. Unity's (or DXVK's?) memory management seems to get very overzealous in this game with how many/how big textures can be stored in advance, so the 8GB VRAM gets quickly filled up w...
On an Nvidia 3060ti setup, I've noticed the game having some significant performance issues in the latter half of the first stage at both 1440p and 1080p. Can anyone confirm if this is similar on Windows?