I downloaded the GOG version (from a secure site) and it runs fine, my PC can handle it and it runs perfectly on medium at a stable 60fps, but sometimes when I play the game it seems "slow", I can't really describe it but it's like the game runs fine at first and then drops below 20fps and when I restart the game it runs fine again.

I know it sounds like the cryptominer from 1337x, but I didn't download from there and the GPU and CPU usage is exactly the same.

The game is installed on an SSD.

I'm running Bottles with wine-ge-proton8-13, dxvk-2.2, vkd3d-proton-2.9 and the problem persists in both dx and vulkan.