this post was submitted on 13 Jul 2025
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Steam Deck

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There is now a Decky Plugin to use Lossless frame gen on Steam Deck (sopuli.xyz)
submitted 3 weeks ago* (last edited 3 weeks ago) by Fubarberry@sopuli.xyz to c/steamdeck@sopuli.xyz
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Trying it out in Shadows of Doubt right now, took performance from an unstable 25-31 fps to 61-71 fps with I set on performance mode and x2 fps. Don't really notice input lag.

It's not on the decky store yet, so you have to download the extension zip manually.

Here's the extension github with full instructions and details.

Basically you'll:

  1. Install the plugin. Once it's on the decky store you can install it from there, but in the meantime do this:

    • Download the .zip from the release page
    • In Game Mode, go to the settings cog in the top right of the Decky Loader tab
    • Enable Developer Options
    • In the new Developer tab, select "Install from zip".
    • Choose the "Lossless Scaling.zip" file you downloaded (likely in the Downloads folder)
    • If it does not show up, you may need to restart your device

  2. Purchase and install Lossless Scaling from Steam

  3. Open the plugin from the Decky menu

  4. Click "Install lsfg-vk" to automatically set up the compatibility layer

  5. Configure settings using the plugin's UI controls:

    • Enable/disable LSFG
    • Set FPS multiplier (2-4) Note: The higher the multiplier, the greater the input lag
    • Enable performance mode - Reduces gpu load, which can sometimes majorly increase FPS gains
    • Adjust flow scale (0.25-1.0)
    • Toggle HDR mode
    • Toggle immediate mode (disable vsync)

  6. Apply launch commands to the game you want to use frame generation with:

    • Option 1 (Recommended): ~/lsfg %COMMAND% - Uses your plugin configuration
    • Option 2: Manual environment variables like ENABLE_LSFG=1 LSFG_MULTIPLIER=2 %COMMAND%
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[–] vividspecter@aussie.zone 3 points 3 weeks ago* (last edited 2 weeks ago)

Another useful use case is that the tool works on videos with mpv to interpolate to a higher frame rate. I know that subjectively not everyone likes that for film, but for footage that doesn't rely on sets and the like such as sport and Youtube videos it's a nice improvement.

In terms of quality vs performance, I'd say it's somewhere between the lower quality SVP default and the higher quality (but very resource intensive) RIFE implementation. There's also LSFG_PERF_MODE=1 and decreasing the flow rate, but the former was a pretty obvious decline in quality, but might be needed on slower GPUs.

EDIT: Another piece of advice I'll give is to set PROTON_USE_WOW64=1 if you're trying to run a 32-bit game, as there isn't a 32-bit build for lsfg-vk at the moment. The env above allows 32-bit games to use 64-bit dependencies, provided it's a Windows game and you use a recent version of Proton (Experimental and likely Proton GE 10 or greater).