Tom Clancy's Rainbow Six Siege
14 community-verified launch options for Tom Clancy's Rainbow Six Siege on Steam ↗.
DeveloperUbisoft Montreal
PublisherUbisoft
Released2015-12-01
EngineAnvilNext
-
-screen-widthCopyOverride the screen width (Unity games)- Effect
- Must be an integer from a resolution the game supports. Pair with -screen-height; alone it can leave a mismatched aspect ratio.
- Example
-screen-width 1920 -screen-height 1080
DisplaySafe -
-screen-heightCopyOverride the screen height (Unity games)- Effect
- Must be an integer from a resolution the game supports. Pair with -screen-width.
- Example
-screen-width 1920 -screen-height 1080
DisplaySafe -
-popupwindowCopyRun in a borderless window (Unity games)- Effect
- Creates the window as a dialog with no frame. Not supported on macOS.
DisplaySafe -
-window-modeCopyOverride fullscreen windowed mode (Unity games, Windows)- Effect
- Takes exclusive or borderless. Windows only. The flag alone does nothing — the value is required.
- Example
-window-mode borderless
DisplaySafe -
-force-openglCopyForce 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.
DisplaySafe -
-force-d3d11CopyForce the Direct3D 11 renderer (Unity games)- Effect
- Windows only.
DisplaySafe -
-force-d3d12CopyForce the Direct3D 12 renderer (Unity games)- Effect
- Windows only.
DisplaySafe -
-force-vulkanCopyForce the Vulkan renderer (Unity games)- Effect
- Useful where the default backend crashes or performs badly; ignored if the build has no Vulkan path.
DisplaySafe -
-force-low-power-deviceCopyUse the low-power GPU (Unity games, macOS)- Effect
- macOS only. Picks the integrated GPU over the discrete one, trading performance for battery life.
Safe -
-vulkanCopyUse the Vulkan renderer where the game supports it (only engines with a Vulkan backend — Source 2, id Tech 6/7, UE4)- Effect
- Forces the Vulkan rendering backend instead of DirectX or OpenGL. Only has an effect in engines with a Vulkan path; ignored elsewhere.
DisplaySafe -
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-DeckSafe -
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-DeckSafe -
-sm4CopyForce the SM4 (DirectX 10) feature level — removed from Unreal in 4.23 (Unreal Engine 4 before 4.23 only)- Effect
- Selected the DX10-era feature set instead of SM5, giving up tessellation, compute shaders and other DX11-level features. Epic removed SM4 in Unreal 4.23, so on any build from 4.23 onward it does nothing at all, and it never existed in Unreal Engine 3 or earlier.
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
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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