The game used to work well without any custom settings however after the recent updates the game became very slow running in default DXVK with 5-15 fps dips so i changed the settings to PROTON_USE_WINED3D=1 %command% and this fixed the FPS issue. FPS is now good and the game is very playable. If you experience the same slowness with DXVK try these settings to fix it.