PCGamingWikiAdded Jul 10, 2026Last checked Oct 17, 2026
Safe
+ScreenWidthCopy
Sets the screen width in pixels.
Display
PCGamingWikiAdded Jul 10, 2026Last checked Oct 17, 2026
Safe
DXVK_ASYNC=1 %command%Copy
Enable asynchronous pipeline compilation in DXVK builds patched with dxvk-async
Proton-Deck
ProtonDBAdded Jul 19, 2026Last checked Sep 27, 2026Also documented for this game on ProtonDB · checked Nov 9, 2026
Safe
PROTON_FORCE_LARGE_ADDRESS_AWARE=1 %command%Copy
Force the LARGE_ADDRESS_AWARE flag (Linux, Proton)
Effect
Lets 32-bit executables address more than 2 GB. Valve documents it as enabled by default, so setting it explicitly is usually a no-op.
Proton-Deck
Valve ProtonAdded Jul 8, 2026Last checked Sep 13, 2026Also documented for this game on ProtonDB · checked Nov 9, 2026
Safe
PROTON_NO_D3D11=1 %command%Copy
Disable d3d11.dll (Linux, Proton)
Effect
For d3d11 games that can fall back to d3d9 and run better that way.
Proton-DeckDisplay
Valve ProtonAdded Jul 9, 2026Last checked Sep 13, 2026Also documented for this game on ProtonDB · checked Oct 17, 2026
Safe
PROTON_USE_WINED3D=1 %command%Copy
Use wined3d (OpenGL) instead of DXVK (Linux, Proton)
Effect
Routes d3d11, d3d10 and d3d9 through OpenGL-based wined3d rather than Vulkan-based DXVK. Usually slower; a fallback where DXVK fails.
Proton-DeckDisplay
Valve ProtonAdded Jul 9, 2026Last checked Sep 13, 2026Also documented for this game on ProtonDB · checked Nov 9, 2026
Safe
WINE_FULLSCREEN_FSR=1 %command%Copy
Upscale with AMD FidelityFX Super Resolution (FSR) through GE-Proton's fullscreen hack, in Vulkan games (DXVK and VKD3D-Proton included)
Proton-DeckDisplay
ProtonDBAdded Nov 13, 2026Last checked Nov 13, 2026Also documented for this game on ProtonDB · checked Nov 13, 2026
Safe
gamemoderun %command%Copy
Run the game under Feral GameMode (Linux)
Effect
Applies temporary host optimisations (CPU governor, I/O and process priority) for the game's lifetime, then restores them on exit. GameMode runs the game, so %command% is what it runs.
Proton-Deck
Feral GameModeAdded Jun 29, 2026Last checked Sep 24, 2026Also documented for this game on ProtonDB · checked Nov 9, 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. MangoHud runs the game, so %command% is what it runs.
Proton-Deck
MangoHudAdded Jun 29, 2026Last checked Sep 24, 2026Also documented for this game on ProtonDB · checked Nov 9, 2026
Safe
How to apply a launch option on Steam
Open Steam and go to your Library.
Right-click the game and choose Properties.
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.
