The Lenovo Legion Go S handheld gaming PC can last over four hours playing Hades—but only when running Valve’s SteamOS, not Windows 11. That’s the stark finding from a wave of community benchmarks and high-profile tech reviewer tests that pit the Linux-based operating system against Microsoft’s incumbent, and the results are nothing short of a wake-up call for Windows on portable devices.

When Dave2D, a respected tech YouTuber, pitted the two operating systems against each other on identical Legion Go S hardware, the numbers told a clear story. The device running SteamOS played Hades at maximum frame rate settings for over four hours. The Windows 11 unit? Less than two hours. That’s a 100% battery life advantage, and it extends across multiple game titles.

This is not an isolated anomaly. Community reports flooding in since Lenovo officially enabled SteamOS support on the Legion Go S confirm that the operating system outperforms Windows 11 in both endurance and raw frame rates. As portable gaming PCs surge in popularity, these benchmark results challenge long-held assumptions about which OS belongs on a handheld.

Battery Life: Twice the Endurance

Gamers have long accepted mediocre battery life as a trade-off for portable PC gaming. Heavy AAA titles often drain a handheld in under two hours. SteamOS shatters that expectation.

In addition to Hades, tests show other popular games—both indie and AAA—gain dramatic longevity under SteamOS. While exact numbers vary by title, users consistently report at least a 50% improvement, often doubling playtime. The reason lies deep in the operating system’s architecture.

Windows 11 carries decades of desktop baggage. Its power management stack is optimized for laptops plugged in most of the time, not for the low-power AMD APUs inside handhelds like the Legion Go S. Background services, telemetry, and updates constantly nibble at the battery. SteamOS, built on a streamlined Linux kernel tuned by Valve specifically for gaming, slashes that overhead.

Valve’s engineers have fine-tuned scheduler behavior, GPU power states, and system processes to stay quiet when a game runs. The difference is tangible. On a cross-country flight or a long commute, the Legion Go S with SteamOS suddenly becomes a far more practical device.

Frame Rates: SteamOS Pulls Ahead

Battery life alone makes a compelling case, but gamers also care about performance. Here, too, SteamOS delivers a measurable lead.

DOOM Eternal, a famously well-optimized shooter, ran at an average of 75 frames per second under SteamOS on the Legion Go S, compared to 66 fps on Windows 11. That 13% gain pushes the game closer to the handheld’s 120Hz display limit, making fast-paced combat noticeably smoother.

Other benchmarks echo the trend. Cyberpunk 2077 and The Witcher 3 showed consistent—though smaller—frame rate improvements. While a 5–10 fps bump might not sound dramatic, it can mean the difference between stuttering and fluidity in demanding scenes. And when paired with double the battery life, the value proposition becomes irrefutable.

Usability: A Console-Like Experience

Ask any Legion Go owner what frustrates them most about Windows 11, and the answer almost always involves the interface. Microsoft’s OS was designed for keyboards, mice, and large monitors. On a 8-inch touchscreen, file dialogs become unreadable, touch targets are tiny, and navigation demands constant thumb gymnastics.

SteamOS offers a fundamentally different approach. Its “Big Picture” mode—the same UI found on the Steam Deck—feels like a game console from the moment you power on. Menus respond instantly to controller input or touch, game libraries are front and center, and system settings are hidden until needed.

There’s no wrestling with taskbars, no accidental right-clicks, no pop-ups demanding a reboot. For anyone who has spent an hour configuring a Windows handheld just to launch a game, SteamOS feels like liberation. The experience is so polished that some users forget they’re on a full Linux PC.

Game Compatibility: Proton Bridges the Gap

The elephant in the room remains game compatibility. Windows still runs every PC game natively, while SteamOS relies on Proton—a compatibility layer that translates Windows API calls to Linux. An honest assessment must acknowledge the shortcomings.

Some multiplayer titles, particularly those with aggressive anti-cheat software like Destiny 2 and certain competitive shooters, refuse to launch under Proton. Others require tweaks or suffer from minor graphical glitches. But the landscape has improved dramatically.

According to ProtonDB, the community database tracking Linux game compatibility, over 80% of the top 1,000 Steam games now run flawlessly or with minor workarounds. Valve’s “Verified” certification ensures that major titles like Elden Ring, Baldur’s Gate 3, and Spider-Man work out of the box. For the average single-player gamer staying within the Steam ecosystem, the practical library gap is small and shrinking.

Why SteamOS Wins: Under the Hood

The technical reasons behind SteamOS’s advantages are worth understanding. Windows 11 runs a sprawling set of background processes—Windows Update, antivirus, telemetry, and dozens of others—that consume CPU cycles and memory even during gaming. SteamOS strips all that away.

Valve ships a custom Linux kernel with latency-reducing patches, an optimized GPU driver stack, and deep integration with the Steam client. When a game launches, the OS enters a focused gaming mode, directing maximum resources to the title. There’s no antivirus scanning game files, no indexer chewing on storage.

Proton itself has become a marvel of engineering. Developed by Valve and CodeWeavers, it now supports DirectX 12, Vulkan, and cutting-edge graphics features. In many cases, Proton can run Windows games faster than Windows itself, thanks to more efficient memory management and advanced shader compilation techniques.

Windows 11’s Handheld Shortcomings

Microsoft has been slow to address the handheld market. Despite partnerships with ASUS, Lenovo, and others, Windows 11 feels bolted onto devices it was never meant for.

Touch interaction remains clunky. On-screen keyboards obscure content, File Explorer demands precise taps, and even simple tasks like adjusting volume require multiple gestures. Custom overlays from OEMs—like Legion Space or Armoury Crate—paper over some cracks but add another layer of complexity.

Automatic updates in Windows can interrupt a game without warning, costing progress or causing disconnects in online matches. Power plans default to “Balanced,” throttling performance unless users dig into control panels. These flaws aren’t just annoying; they degrade the core gaming experience.

How to Get SteamOS on Your Legion Go S

Installing SteamOS on the Legion Go S is not yet a one-click affair, but Lenovo and Valve have drastically simplified the process. Official installation images are available, and community guides walk users through flashing a USB drive, booting from it, and replacing the existing Windows partition.

The process typically takes under an hour. All necessary drivers—for Wi-Fi, Bluetooth, the controller, and the custom AMD APU—are bundled into the image. Some users report needing to adjust the fan curve or remap a button or two, but no advanced technical skills are required.

For those unwilling to tinker, Lenovo now sells a Legion Go S model with SteamOS pre-installed. This signals a significant shift in manufacturer strategy and validates SteamOS as a first-class option.

What This Means for Handheld Gaming

The benchmarks from the Legion Go S are more than just numbers. They prove that a Linux-based, purpose-built gaming OS can vastly outperform Windows on identical hardware. This puts pressure on Microsoft to respond.

Rumors of a “Windows Handheld Mode” or an “Xbox OS” for third-party devices have circulated for months. If Microsoft wants to retain its dominance in PC gaming, it must deliver a lean, controller-friendly interface with aggressive power management. The Legion Go S data shows the gap is urgent.

Valve, meanwhile, continues to expand SteamOS beyond its own Steam Deck. Lenovo’s embrace is just the beginning. AMD and Intel are both investing heavily in mobile gaming silicon, and a standardized, optimized OS could ignite a new wave of handheld innovation.

The Bottom Line

For current Legion Go S owners, switching to SteamOS is the single biggest upgrade you can make—offering double the battery life, higher frame rates, and a far more pleasant user experience. The only hurdle is game compatibility, and for most players, it’s a small one.

Prospective buyers now face a real choice: a Windows handheld that works like a tiny laptop, or a SteamOS handheld that works like a game console. The benchmarks make a strong argument for the latter.

The handheld PC market is at a turning point. Valve’s open-source approach has leapfrogged Microsoft in the very arena Windows once owned unchallenged. As more devices ship with SteamOS and Proton continues to mature, the notion that Windows is mandatory for PC gaming may finally fade. For the millions who want to play on the go, that future looks brighter than ever.