Thief
13 community-verified launch options for Thief on Steam ↗.
DeveloperEidos-Montréal
PublisherEidos Interactive Corp.
Released2014-02-27
EngineUnreal Engine
-
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-DeckSafe -
PROTON_USE_WINED3D11=1CopyLegacy option: use OpenGL-based WineD3D for Direct3D 11 instead of DXVK (superseded by PROTON_USE_WINED3D)Proton-DeckDisplaySafe -
PROTON_FORCE_LARGE_ADDRESS_AWARE=1 %command%CopyForce 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-DeckSafe -
PROTON_USE_WINED3D=1 %command%CopyUse 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-DeckDisplaySafe -
PROTON_NO_ESYNC=0CopyKeep eventfd-based synchronization enabled (Proton default)Proton-DeckSafe -
-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 -
-dx11CopyUse the DirectX 11 renderer (Unreal Engine games)- Effect
- Selects DX11 as the RHI. Ignored by builds without a DX11 path.
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 -
-fullscreenCopyRun in fullscreen mode (Unreal Engine and Source games)- Effect
- Overrides a saved windowed preference. -full is the same option in Source.
DisplaySafe -
-dx12CopyUse the DirectX 12 renderer (Unreal Engine games)- Effect
- Selects DX12 as the RHI. Ignored by builds without a DX12 path.
DisplaySafe -
-nolauncherCopySkip the game's external launcher (only games that ship a launcher)- Effect
- Starts the game directly instead of opening its separate launcher or configuration window first. The exact spelling varies per title.
Experimental -
-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 -
-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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