Does Lost Soul Aside Run Well on Steam Deck? The Definitive Setup Guide

If you follow action RPG releases, you’ve probably wondered: is Lost Soul Aside on Steam Deck a viable experience? Watch the video at the end of the article.

After a troubled launch in August 2025, marked by cinematic failures and instability, the answer changed drastically.

With the arrival of Patch 1.101 in November, Ultizero Games transformed the game. In this article, we deeply analyze the current performance and provide the definitive guide for running Lost Soul Aside on Steam Deck with the best possible visual quality and fluidity.

Lost Soul Aside on Steam Deck: The Current State of Performance

The trajectory of Lost Soul Aside on Steam Deck was complex. Initially classified as “Unsupported,” the game suffered because the Unreal Engine 4 graphical engine demanded too much from the Van Gogh APU. Players reported cinematics running at 1 FPS due to codec issues and memory leaks that caused the game to crash.

Fortunately, update 1.101 fixed the video codecs and optimized memory management. Today, we can confirm that playing Lost Soul Aside on Steam Deck is entirely possible and satisfactory, provided you align your expectations and settings.

Expectation vs. Reality: 30, 40 or 60 FPS?

It is important to be realistic about the hardware. Trying to run Lost Soul Aside on Steam Deck at a constant 60 FPS is technically unfeasible due to the CPU bottleneck in dense areas. The “sweet spot” for a fluid experience is:

• Steam Deck OLED: Lock at 40 FPS / 40Hz. This offers a much snappier control response (25ms frametime).
• Steam Deck LCD: Lock at 30 FPS / 60Hz. Ensures a stable frametime and consistent visuals.

Best Settings for Lost Soul Aside on Steam Deck

To extract the maximum from the game, standard presets are not enough. Below, we detail the essential guide to optimizing Lost Soul Aside on Steam Deck, balancing graphical beauty and performance.

System Adjustments for Lost Soul Aside on Steam Deck

Before opening the game, make these adjustments in the SteamOS quick access menu:

• Frame Rate: 40 (OLED) or 30 (LCD).
• TDP Limit: Off (the game needs the full 15W).
• GPU Clock: Manual at 1600 MHz (helps prevent drops during CPU usage peaks).
• Proton: GE-Proton (latest version) is recommended to ensure the best codec compatibility in cinematics.

In-Game Graphics Settings for Lost Soul Aside on Steam Deck

Within the game, these are the golden definitions based on technical analysis:

• Display Mode: Borderless Windowed.
• Resolution: 1280 x 800 (Native).
• V-Sync: Off.
• Motion Blur: Off (improves clarity on small screens).

Quality and Upscaling Options:

The secret to running Lost Soul Aside on Steam Deck lies in FSR. Do not try to run it at native resolution without upscaling.

• Upscaling: AMD FSR 2.x or 3.x.
• FSR Quality: Balanced. Performance mode degrades the image too much, and Quality might strain intense combat.
• Texture Quality: High. The Deck can handle high textures without an FPS cost.
• Shadows and Effects: Medium. Essential for maintaining stability.
• Ray Tracing: OFF. Warning: Never activate Ray Tracing for Lost Soul Aside on Steam Deck. This will make the game unplayable.

Advanced Optimization for Lost Soul Aside on Steam Deck

If you want to ensure there are no “Fatal Errors” due to lack of memory during long sessions, there are two advanced tricks recommended by the technical community:

1. VRAM Increase (BIOS): Increase the UMA buffer in the Steam Deck BIOS from 1GB to 4GB. This helps the game better manage heavy textures.
2. Launch Options: If you experience stuttering, try forcing DirectX 11. In the game properties on Steam, type: -dx11.

Conclusion: Is it worth playing on the handheld?

With the fixes in Patch 1.101 and the settings above, the experience of Lost Soul Aside on Steam Deck has transformed from frustrating to fantastic. The frantic “Devil May Cry” style combat shines on the handheld screen, especially on the OLED model.

Although it requires graphical compromises and the mandatory use of FSR, Lost Soul Aside on Steam Deck is now one of the best ways to take this action RPG anywhere. Just make sure to keep Ray Tracing off and enjoy the journey!

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