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AMD FidelityFX Super Resolution (FSR) is a family of technologies that reconstructs a higher-resolution image from lower-resolution rendered imagery. In a browser-based graphics tool, a library such as Three.js can apply FSR 1 to a rendered scene. That is different from a browser-wide switch that sharpens every video you watch: FSR must be integrated into an application, and the documented browser example is a graphics-rendering effect.
What FSR means
FSR stands for AMD FidelityFX Super Resolution. It is a family of upscaling technologies, not one universal browser feature. An application renders imagery at a lower resolution, then an upscaler reconstructs an image for a larger output. The result is reconstructed detail, not detail recovered from the original scene with certainty.
Generation matters. AMD distinguishes spatial FSR 1 from temporal FSR 2 and FSR 3, and describes newer ML-based FSR Upscaling separately. Do not assume that capabilities or hardware statements for one generation apply to another. AMD’s FSR technologies overview provides its current feature and compatibility distinctions.
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How FSR 1 works in a browser-rendered scene
Three.js documents FSR1Node as a post-processing effect and provides a WebGPU example. The node takes a texture node, sharpness parameter, and denoise setting. Its FSR 1 pipeline uses EASU (Edge-Adaptive Spatial Upsampling) to reconstruct the image using local edge direction, followed by RCAS (Robust Contrast-Adaptive Sharpening). Three.js recommends an anti-aliased source image.
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This is an effect in a rendering pipeline: the application renders a scene, then applies the node to its image. It is not a control that a user can turn on for arbitrary websites. See the Three.js FSR1Node documentation and its WebGPU FSR example.
FSR 1 versus temporal FSR 2 and FSR 3
FSR 1 is spatial: it works from an individual rendered image. FSR 2 and FSR 3 are temporal approaches that accumulate information across frames. AMD’s FSR 3 integration documentation calls for current rendered color and depth inputs along with temporal information. An interactive renderer can expose scene data such as depth; a standard video element does not ordinarily provide the same renderer inputs.
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| Approach | What it uses | What the browser example establishes |
|---|---|---|
| FSR 1 | A single rendered image; Three.js recommends an anti-aliased source. | Three.js documents a post-processing node and a WebGPU example. |
| FSR 2 and FSR 3 | Multiple frames and temporal scene inputs, including color and depth in AMD’s FSR 3 integration documentation. | A separate Three.js community project describes a WebGPU temporal upscaler; this is not the same implementation as Three.js FSR1Node. |
FSR 3 frame generation is related but separate: it generates interpolated frames using real input frames and motion-vector data. It is not another name for upscaling. AMD’s FSR 3.1.5 technique documentation describes the temporal integration and its inputs.
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Not automatically. AMD says game-oriented FSR requires developer integration. Its separate Radeon Super Resolution (RSR) feature is driver-based and, according to AMD, applies to supported games running in exclusive full-screen mode on qualifying Radeon hardware. That is not a general enhancement switch for browser video playback. AMD explains the distinction in its Radeon Super Resolution FAQ.
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Three.js can wrap an HTML video element in a VideoTexture so a renderer can display video as a texture. That makes video usable inside a rendered scene; it does not establish that FSR is built into browser players or can be applied to arbitrary protected streams. The Three.js VideoTexture documentation describes that renderer capability.
Will FSR make a browser graphics tool faster?
It depends on the workload. Upscaling has its own processing cost, so it can be slower than native-resolution rendering when the scene is simple or the GPU is not limited by fragment shading. Three.js explicitly cautions: “Only use FSR 1 if your application is fragment-shader bound and cannot afford to render at full resolution.” The practical question is whether rendering fewer pixels saves more time than the effect consumes. Compare performance on the actual scene and target device rather than assuming an uplift.
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Browser and hardware compatibility
Compatibility depends on both the browser graphics API and the specific implementation. Three.js provides WebGPU.isAvailable() to check WebGPU support. Its WebGPURenderer documentation says it attempts WebGPU where supported and falls back to WebGL 2 otherwise; that renderer fallback does not guarantee every post-processing effect behaves identically on both backends. See the WebGPU utility documentation and WebGPURenderer documentation.
The community project @pmndrs/upscaler describes its temporal Three.js upscaler as WebGPU-only, integrated with WebGPURenderer, and without a WebGL fallback. Those are project-specific requirements, not browser-wide FSR requirements; check the project’s current documentation before integrating it.
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AMD lists generation-specific hardware support for its own implementations: its overview begins FSR 1 support with Radeon RX 400-series graphics, FSR 2 with RX 590-class graphics and select Ryzen APUs, and FSR 3 upscaling with RX 590-class graphics, while frame generation has a higher stated Radeon generation requirement. AMD describes ML-based FSR Upscaling separately with newer Radeon support. These statements concern AMD’s technologies, not minimum requirements for every web implementation. The reviewed Three.js documentation does not state a minimum GPU model for FSR1Node.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What AMD’s memory estimates do—and don’t—tell you
AMD’s current FSR 3.1.5 technique documentation gives approximate working-set estimates measured on an RX 9070 XT under DX12. At 3840×2160, it lists 292 MB for Quality, 256 MB for Balanced, 226 MB for Performance, and 176 MB for Ultra Performance. At 1920×1080, it lists 75 MB, 65 MB, 61 MB, and 45 MB for those presets, respectively. AMD says the rounded figures are subject to change. They are not browser benchmarks, universal system requirements, or estimates for Three.js FSR 1.
How to decide whether a browser implementation fits
- Identify the content. A rendered interactive scene, video rendered as a scene texture, and ordinary streaming playback are different pipelines.
- Identify the generation and integration. Three.js FSR1Node is a documented spatial post-process; temporal approaches require more renderer data and a compatible implementation.
- Check the backend. Test WebGPU availability and confirm the chosen library’s behavior if the browser uses a WebGL 2 path.
- Measure the real workload. Compare native rendering and upscaling on the target device; shader-bound scenes are the use case Three.js highlights for FSR 1.
These checks avoid the common mistake of treating the name “FSR” as a browser-level video setting. It describes technologies that an application or supported driver path must actually integrate.
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