Proton launch options builder

Pick options, copy the Steam launch string or download a shell script. Every option here is documented by Proton, DXVK, MangoHud or GameMode. It all runs in your browser.

Wrappers

Programs that run around the game.

GameMode gamemoderunFeral GameMode: requests performance tuning while the game runs. Needs the gamemode package installed.
MangoHud overlay mangohudFPS and performance overlay. Needs MangoHud installed.

Proton

Environment variables documented in Proton's README. Mostly for troubleshooting.

Write Proton log PROTON_LOG=1Dumps a debug log to steam-<appid>.log in your home folder (or PROTON_LOG_DIR).
Disable esync PROTON_NO_ESYNC=1Do not use eventfd-based in-process synchronization primitives. Troubleshooting only.
Disable fsync PROTON_NO_FSYNC=1Do not use futex-based in-process synchronization primitives. Troubleshooting only.
Use wined3d instead of DXVK PROTON_USE_WINED3D=1Use OpenGL-based wined3d instead of Vulkan-based DXVK for d3d11, d3d10 and d3d9.
Report NVIDIA GPU as AMD PROTON_HIDE_NVIDIA_GPU=1Some games need this if they depend on Windows-only NVIDIA driver functionality.

DXVK

Environment variables documented in DXVK's README (Direct3D 9/10/11 games).

DXVK HUD DXVK_HUDShows DXVK's built-in overlay for Direct3D 9/10/11 games.
DXVK log level DXVK_LOG_LEVELControls DXVK message logging.

There is no switch for Easy Anti-Cheat or BattlEye here. They only work under Proton when a game's developer has enabled Linux support, and no launch option changes that.