It's not a matter of nvidia card or anything. I tried the game on several different machines: MacBook Pro with intel GPU, i7 3770k + NVIDIA GTX 660Ti + 16 GB RAM, i7 3770k + NVIDIA GTX 1070 + 16 GB RAM and finally Ryzen 5950x + NVIDIA RTX 3080 + 64 GB RAM . On slower GPUs I was starting at 20-60 FPS, with Ryzen + RTX 3080 I started with 100-140 FPS and they were gradually dropping down to around 30 FPS. Restarting the game brings FPS back up to the initial value and then during the first hour of playing FPS slowly plummets down to 20-30 again. Nothing helps (reducing graphics in settings etc), no hardware helps. I think there is no way in the world to run this game and have enjoyable experience on any kind of hardware in the world at the moment.