Clair Obscur: Expedition 33
17 sourced launch options for Clair Obscur: Expedition 33 on Steam ↗.
DeveloperSandfall Interactive
PublisherKepler Interactive
Released2025-04-24
EngineUnreal Engine 5
-
DXVK_ASYNC=1 %command%CopyEnable asynchronous pipeline compilation in DXVK builds patched with dxvk-asyncProton-Deck -
MANGOHUD=1CopyShow 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.
- Example
mangohud %command%
Proton-Deck -
PROTON_ENABLE_NVAPI=1 %command%CopyEnable NVIDIA's NVAPI GPU support libraryProton-Deck -
PROTON_ENABLE_WAYLAND=1 %command%CopyUse Wine's experimental Wayland driver instead of the default X11 driver, in GE-Proton and Proton-CachyOS (Valve's Proton does not include it)Proton-Deck -
PROTON_NO_D3D11=0 %command%CopyExplicitly turn off Proton's nod3d11 setting, so d3d11.dll stays enabledProton-DeckDisplay -
PROTON_NO_ESYNC=1 %command%CopyDisable eventfd-based synchronisation (Linux, Proton)- Effect
- Turns off in-process esync primitives. Worth trying for games that hang or crash under Proton.
Proton-DeckValve Proton Added Jul 8, 2026 Last checked Sep 13, 2026 Also documented for this game on ProtonDB · checked Nov 9, 2026Safe -
PROTON_NO_FSYNC=1 %command%CopyDo not use futex-based in-process synchronization primitivesProton-Deck -
WINEDLLOVERRIDES=dxgi=n,b %command%CopySet the override type and load order for DLLs — native Windows (n) or Wine builtin (b)Proton-Deck -
gamemoderun %command%CopyRun 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-DeckFeral GameMode Added Jun 29, 2026 Last checked Sep 24, 2026 Also documented for this game on ProtonDB · checked Nov 9, 2026Safe -
mangohud %command%CopyShow 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 -
-dx11CopyUse the DirectX 11 renderer (Unreal Engine games)- Effect
- Selects DX11 as the RHI. Ignored by builds without a DX11 path.
DisplaySafe -
-dx12CopyUse the DirectX 12 renderer (Unreal Engine games)- Effect
- Selects DX12 as the RHI. Ignored by builds without a DX12 path.
DisplaySafe -
-fullscreenCopyRun in fullscreen mode (Unreal Engine and Source games)- Effect
- Overrides a saved windowed preference. -full is the same option in Source.
DisplaySafe -
-ResX=1920CopySet the window width in pixels (Unreal Engine games)- Effect
- Takes its value with = and no space. Epic pairs it with -ResY and -windowed.
- Example
-windowed -ResX=1920 -ResY=1080
DisplaySafe -
-ResY=1080CopySet the window height in pixels (Unreal Engine games)- Effect
- Takes its value with = and no space. Epic pairs it with -ResX and -windowed.
- Example
-windowed -ResX=1920 -ResY=1080
DisplaySafe -
-USEALLAVAILABLECORESCopyUse all available CPU cores (Unreal Engine games)- Effect
- Lifts a core-count limit the engine would otherwise apply. Epic documents it as "Use all available cores."
PerformanceSafe -
-windowedCopyRun in windowed mode (Unreal Engine and Source games)- Effect
- Unreal documents pairing it with an explicit resolution. In Source -window, -sw and -startwindowed are the same option.
- Example
-windowed -ResX=1920 -ResY=1080
DisplaySafe
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.
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