Lossless Scaling | FPS Boost Tool

Lossless Scaling is a windowed-game upscaler and frame generator that works on almost any title, including vanilla and heavily modded Minecraft. You run the game in a borderless window, then let the app scale it to fullscreen while inserting extra frames between the ones your GPU actually renders. The payoff is smoother motion and a higher effective frame rate without touching your modpack or shader settings.

What Lossless Scaling Actually Does

The app handles two separate jobs. First, it upscales a windowed image to your native resolution using algorithms like LS1, AMD FidelityFX Super Resolution, NVIDIA Image Scaling, Integer, XBR, and Anime4K. That lets you render the game at a smaller internal size and sharpen it back up, trading a little image quality for a lot of headroom. Second, its LSFG frame generation model creates additional frames to smooth out gameplay. The current model is LSFG 3, which ships a Fixed mode that multiplies your frame rate and an Adaptive mode that targets a specific refresh rate. Both jobs run after the game has drawn its frames, so they work on titles that have no built-in scaling or frame generation of their own.

Why Modded Minecraft Benefits

Minecraft does not ship with frame generation, and modpacks can drag even fast GPUs down into the 40s and 50s. Lossless Scaling fills that gap. Lock your game to a steady base frame rate first, then let LSFG multiply it. A locked 60 can become 120 or higher on a high-refresh monitor. Adaptive Frame Generation is especially useful when your monitor refresh rate is not a clean multiple of your capped frame rate, which is the common case for players capped at 60 on a 144 Hz or 165 Hz panel.

It also pairs cleanly with shaders, because it operates on the final windowed output rather than the render pipeline itself. If you run a shader pack on top of a Fabric setup, the layers stack without conflict. Upscale first, let the shader do its work, then let LSFG generate frames on top of that finished image.

Setting Up Lossless Scaling for Minecraft

After installing the app, launch it from your desktop.

You will see a dense settings window. Most of it can stay at the defaults for a first pass.

Create a dedicated profile for Minecraft by clicking the + Add button. Profiles let the app auto-apply your tuned settings whenever it detects the game executable, and you can keep separate profiles for other titles.

Recommended Minecraft Settings

Scaling Mode: Set this to Custom. A factor of 1.33 is a solid starting point, and enable "Resize before scaling." Higher factors trade image quality for more frame headroom, so push the value up if you need raw speed and drop it back if the picture softens.

Scaling Type: Minecraft feels cleanest with scaling type left off. If you want another layer of FPS, LS1 is the best pick of the available algorithms.

Frame Generation: This is the setting that does the heavy lifting. Pick the newest LSFG version available and set the mode to x2. x3 and higher exist but demand a stronger GPU and can introduce artifacts on fast camera motion.

Performance Option: This drops image quality for extra throughput. Leave it off unless you are struggling for frames, then toggle it and compare the result.

Adjust Cursor Speed: Enable this if your cursor feels detached from the action on screen. Scaling introduces a small disconnect between pointer movement and game response, and this option corrects it.

Fine-Tuning for Your GPU

These are starting values, not laws. The right balance depends on your GPU class and how heavy your modpack is. The screenshot below shows one tuned configuration that holds over 100 effective FPS with the base game locked at 50.

Here is a short clip of the effect in action. The on-screen counter reads 50 because the game was locked there and OBS could not read the app's own counter, but the real perceived frame rate is well over 100.

Frequently Asked Questions

Is Lossless Scaling safe for multiplayer and anti-cheat?

The community has used it alongside games with built-in anti-cheat without issues, but this is not an official guarantee from every anti-cheat vendor. For Minecraft multiplayer on servers with custom anti-cheat, test on a private world first. Frame generation only touches the final windowed image, so it does not modify game files or memory.

Does it work with shader packs?

Yes. Because Lossless Scaling operates on the windowed output rather than the render pipeline, it sits on top of whatever shader you are running. Pair it with a tuned OptiFine install or Iris shaders and the layers stack without conflict.

Is it free?

No. It is a paid Steam app around the price of a coffee, and it goes on sale regularly. One purchase covers every game you own, not just Minecraft, which makes the cost easy to justify if you play a mix of older or modded titles. Grab it from the official Lossless Scaling store page.

Will it fix a genuinely weak PC?

Only partly. You need a base frame rate of roughly 30 FPS at 1080p or 40 at 1440p for frame generation to look clean. If your machine already struggles to hold 30, no scaler will rescue it. Lower your render distance and shader settings first, then layer Lossless Scaling on top.

Do I need to keep the app running while I play?

Yes. Hit Scale before you switch to the Minecraft window. The app hooks the windowed output in real time, so it needs to stay active during your session.

If you want to push Minecraft performance further before adding Lossless Scaling, tune your loader and shader setup first, then layer this on top for the final frame rate boost.