Force the legacy OpenGL renderer (Unity games, legacy builds)
Effect
Windows only. Selects Unity's LEGACY OpenGL backend, not the core profile — use -force-glcore for that. Builds made with newer Unity versions may not carry the legacy backend at all, in which case this has no effect.
Applies temporary host optimisations (CPU governor, I/O and process priority) for the game's lifetime. The bare word does nothing — Steam needs the wrapper form.
Proton-Deck
Feral GameModeAdded Jun 29, 2026Last checked Aug 16, 2026
Safe
mangohud %command%Copy
Show the MangoHud performance overlay (Linux)
Effect
Draws FPS, frame timing and CPU/GPU load over Vulkan and OpenGL games. The bare word does nothing — Steam needs the wrapper form.
Proton-Deck
MangoHudAdded Jun 29, 2026Last checked Aug 16, 2026
Safe
-force-low-power-deviceCopy
Use the low-power GPU (Unity games, macOS)
Effect
macOS only. Picks the integrated GPU over the discrete one, trading performance for battery life.
On the General tab, find the Launch Options field.
Type or paste the option (e.g. -windowed) into the field. To use several at once, separate them with spaces (e.g. -windowed -novid).
Close Properties. Steam saves automatically, and the option applies next time you launch the game.
To remove one, reopen the same field and delete the text. Options are game-specific; an option that helps one game may do nothing (or misbehave) in another.
Worth knowing: a launch option can break a game's rendering, reset local settings, or trip anti-cheat in multiplayer. Read the description first, add one at a time, and treat anything rated above Safe as a deliberate experiment.
