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Use Steam Linux Runtime for a game’s native Linux build. Use Proton for the Windows build, including a Windows-only Steam game. They are complementary rather than competing choices: Steam Linux Runtime provides a controlled Linux userspace and library environment, while Proton translates Windows game interfaces so Windows software can run on Linux.
The confusing part is that Proton also runs inside a Steam Linux Runtime generation such as Soldier, Sniper, or steamrt4. That label identifies the supporting container, not a second Windows compatibility layer. Once you separate the game build from the runtime underneath it, the choice is straightforward.
Steam Linux Runtime and Proton solve different problems
Steam Linux Runtime is a controlled Linux environment
Valve describes Steam Runtime as a binary-compatible Linux runtime. Steam packages a known library stack and starts the game in a container so behavior depends less on the libraries and distribution details installed on the host system. The container launcher, called pressure-vessel, assembles that environment around the game process.
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This is primarily a consistency and compatibility layer for Linux software. It does not convert a Windows executable into a Linux application. If a title has a native Linux executable, the runtime can provide the userspace that executable expects.
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Proton is the Windows-game compatibility tool
Valve’s Proton repository defines Proton as a Steam Play compatibility tool based on Wine and additional components. Proton supplies the Windows API translation and integration needed to launch many Windows games on Linux. You select a Proton release per game in Steam’s compatibility settings when you need to override the default.
Proton is therefore the relevant choice for a Windows-only game or for a game whose Windows build works better for you than its native Linux build. Steam Linux Runtime by itself cannot run a Windows executable; Proton is the layer that performs that translation.
The decision in one table
| Question | Steam Linux Runtime with a native build | Proton with a Windows build |
|---|---|---|
| What game code runs? | The title’s Linux executable and native Linux assets | The title’s Windows executable and Windows assets |
| Is Windows API translation involved? | No Windows translation is needed for the native path | Yes. Proton uses Wine-based translation and supporting components |
| What does the runtime provide? | A controlled Linux userspace, libraries, and container environment | The same kind of controlled Steam runtime environment underneath Proton, plus Proton’s Windows-compatibility components |
| Best default use | A game offered with a native Linux version | A Windows-only game or a Windows build you deliberately choose |
| What changes when you switch? | Changing to Proton changes the game build from Linux to Windows | Changing Proton versions keeps the Windows build but changes the compatibility-tool release |
That distinction matters when troubleshooting. Moving a native title to Proton is not a like-for-like runtime swap: you are replacing the Linux executable with the Windows version. For a Proton title, changing from one Proton release to another keeps the Windows game path while changing the translation and support stack.
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If the game offers a native Linux version
Start with the native Linux path and the Steam Linux Runtime version Steam offers for that title. The runtime is intended to supply the libraries and container environment expected by the native build. Keep this path when it launches and performs correctly, because it avoids adding a Windows translation layer and preserves the developer’s Linux executable.
If the native build has a specific problem, first try another runtime version offered for the game or by its developer. If you switch to Proton, treat that as a compatibility workaround: you are testing the Windows build, with its own patches, settings, save-data behavior, and possible differences from the Linux version.
If the game is Windows-only
Select Proton. Proton is the component that makes a Windows executable usable on Linux; Steam Linux Runtime alone cannot do that. Steam may select a Proton release automatically, or you can force one for a particular title when the default has a regression or lacks a feature you need.
If you are unsure what Steam selected
Open the game’s properties and inspect the Compatibility section. A label such as Soldier or Sniper can appear because the selected Proton build uses that Steam container runtime. It does not mean Steam is offering Soldier or Sniper as an alternative to Proton for the same Windows executable. The Windows compatibility layer remains Proton; the named runtime is the Linux environment supporting it.
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- Steam chooses a game build. A title may have a native Linux build, a Windows build, or both.
- Steam starts the supporting runtime. The Steam Linux Runtime container supplies a predictable Linux userspace and library set. Its launcher, pressure-vessel, places the process in that environment.
- Proton is added for the Windows build. When Proton is selected, Wine-based components translate Windows calls and connect the game to Linux graphics, audio, input, and Steam services.
- The game runs inside that combined arrangement. For a native title, the Linux executable uses the runtime. For a Windows title, the Windows executable uses Proton, which itself uses a Steam runtime generation.
Valve summarizes this relationship in its Steam Runtime documentation: “The Steam Runtime is also used by the Proton Steam Play compatibility tools, which run Windows games on Linux systems.” In Steam’s interface, the broader term Steam Play covers both the container-runtime framework for Linux games and Proton for Windows games.
Steam Linux Runtime generations and their Proton families
Valve’s current bug-reporting documentation associates these runtime generations with Proton families. The app IDs are identifiers for Steam components, not performance scores or compatibility percentages.
| Runtime generation | Steam app ID | Documented association | What the label tells you |
|---|---|---|---|
| Steam Linux Runtime 1.0 (Scout) | 1070560 | Older native Linux games; combines legacy Scout libraries with a Soldier container | A legacy native-Linux support path |
| Steam Linux Runtime 2.0 (Soldier) | 1391110 | Official Proton 5.13 through 7.0 | The container generation supporting those Proton families |
| Steam Linux Runtime 3.0 (Sniper) | 1628350 | Official Proton 8.0 through 10.0 and some native Linux games | A newer container used by those Proton releases and selected native titles |
| Steam Linux Runtime 4.0 (steamrt4) | 4183110 | Official Proton 11 or newer and newer native Linux games | The runtime generation associated with newer Proton and native releases |
These are version-family mappings, not a guarantee that every game behaves identically across releases. A title can regress in one Proton version, depend on a particular runtime library, or require a feature that arrived in a later release. Use the table to understand the label and narrow troubleshooting, then test the specific version Steam provides for that game.
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How to let Steam install the required runtime
Normally, you do not download a separate runtime package manually. Valve says Steam automatically downloads each required container runtime to a Steam library when a game or Proton version needs it.
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- Allow Steam to finish downloading any Steam Linux Runtime or Proton component it queues.
- Launch the game once so Steam can create the required prefix and cache data for the selected compatibility tool.
- If Steam reports a missing component, restart Steam and check the Downloads page for a paused or failed runtime download.
- Keep enough free space in the library that contains the game and Steam tools; the runtime is installed as Steam content and must be available when the game starts.
The exact download location can vary when you use multiple Steam libraries. The important point is that the runtime is managed as Steam content, not as a system-wide Linux package that you must install with your distribution’s package manager.
How to force a Proton version for one game
Use this procedure when a Proton game stops launching after an update, has a known regression, or needs a feature present in another Proton release.
- In your Steam Library, right-click the game and choose Properties.
- Open Compatibility.
- Enable Force the use of a Specific Steam Play compatibility tool. Steam may capitalize “Specific” differently depending on its client build, but the control is the per-game force-Proton setting documented by Ubuntu.
- Choose an installed Proton release from the list.
- Close the dialog and launch the game.
- Test the result with the same graphics settings and launch options you used before changing the version. This isolates the Proton change from unrelated configuration changes.
If the game works on the newly selected release, leave it there temporarily and record the version. If it fails, return to the previous working release or clear the force-selection checkbox to let Steam use its default. A Proton change can require Steam to download another runtime generation and can create a separate compatibility prefix for that version.
Native Linux troubleshooting without changing the game build
The game launches but reports missing libraries
Confirm that the game’s intended Steam Linux Runtime is installed and selected. Restart Steam so a pending runtime update can complete, then verify the game files. Avoid replacing the native executable with Proton until you have established that the issue is specific to the native path.
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The game worked before a runtime update
Check whether the title offers another runtime choice in its properties or launch configuration. Runtime generations have different library stacks, so an older native game may behave differently under a newer environment. Keep the working combination noted before testing alternatives.
You are considering Proton as a workaround
That can be reasonable when the native build is unusable, but compare the correct things: you are now running the Windows build. Check that save locations, workshop content, controller mappings, and graphics settings are present in the new prefix. Do not assume a native-Linux bug has been fixed merely because the Windows build launches.
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The game stopped launching after a Proton update
Use the Compatibility section to force the last Proton release that worked, then test another Valve Proton release one at a time. This produces a useful comparison and avoids changing several variables simultaneously.
The game launches but a feature is broken
Identify whether the problem appeared with a Proton version change, a game patch, or a graphics-driver update. Test a different Proton release while keeping the same game build and settings. The runtime label may change from Soldier to Sniper or steamrt4 as you move between Proton families; that is expected and does not mean you accidentally switched to a native Linux executable.
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Steam keeps downloading a runtime
Let the download finish, especially after selecting a Proton release from a different family. Verify that the Steam library has space and that the Downloads page shows no paused or failed item. Removing runtime content manually can force Steam to download it again and can make diagnosis harder.
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Does Proton run faster than Steam Linux Runtime?
There is no authoritative universal FPS figure or compatibility percentage proving that one option is always faster. The two options usually run different game builds, so a direct comparison is not a controlled runtime-only test. Performance depends on the game, graphics API, driver, Proton release, runtime generation, shader and cache state, and the game’s own Linux or Windows implementation.
For a native Linux title, start with the native build and its supplied runtime. For a Windows-only title, Proton is the required path. When both builds exist and you are troubleshooting performance, compare the same scene, resolution, frame limiter, driver version, and game settings, and record the exact runtime and Proton versions. Treat the result as title-specific rather than a general rule about Linux runtimes.
What this means on Steam Deck and other SteamOS systems
SteamOS is Linux-based, and Valve attributes broad Steam-library compatibility on Steam Deck to Proton. A Windows game shown as playable through Proton still uses a Steam Linux Runtime generation underneath the Proton tool. A native Linux game can instead use its native executable with the appropriate runtime.
Steam Deck therefore does not replace either component. It is hardware running a Linux-based operating system; Proton remains the Windows-game compatibility layer, and Steam Linux Runtime remains the controlled Linux environment used by native games and by Proton itself.
A practical selection checklist
- Native Linux executable available: use the native path and the runtime Steam offers first.
- Windows-only executable: use Proton.
- Native title has a runtime-specific failure: test another runtime offered for that title before changing builds.
- Proton title has a regression: force a different Proton release in Properties > Compatibility.
- Steam shows Soldier, Sniper, or steamrt4: read it as the supporting container generation for the selected Proton or native build.
- Steam asks for a runtime download: allow Steam to install it; a separate system package is normally unnecessary.
- You want a performance verdict: benchmark the specific game and versions; no universal ranking is established.
Keeping the choice maintainable
Valve can change runtime-to-Proton mappings, SteamOS messaging, and support policies as new releases ship. If you maintain a Linux gaming setup or publish a compatibility guide, record the game build, Proton release, runtime generation, driver, and relevant launch options whenever you find a working configuration. Recheck Valve’s current Steam Runtime and Proton documentation before relying on a mapping for a long-lived guide.
The durable rule is simple: choose the executable first, then the layer that supports it. Native Linux executable means Steam Linux Runtime; Windows executable means Proton, with Steam Linux Runtime providing the container underneath.
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