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WebGPU vs WASM in browser background removal

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How GPU acceleration changes wall-clock time for local segmentation, when fallback paths matter, and what merchants should expect on real hardware.

Two runtime paths, one goal

Browser-based background removal must run neural networks in a tab. nobg.eu attempts WebGPU acceleration when the browser exposes a compatible adapter; otherwise WASM/CPU fallback keeps the workflow alive.

What WebGPU changes

WebGPU maps matrix operations in segmentation models to compute shaders. On capable laptops, wall-clock time to first preview often drops compared with CPU-only paths—especially above 2–3 megapixels.

WebGPU does not automatically improve mask quality. It changes how fast you iterate, which matters when QAing fifty SKUs.

WASM fallback reality

Integrated GPUs, older drivers, corporate-managed browsers, and some mobile builds may skip WebGPU. Fallback is not failure—it is compatibility. Expect longer runs on large PNGs; downscale for draft passes if needed.

How to benchmark your stack

  1. Use the same source image on desktop Chrome and Safari.
  2. Note time-to-preview after models are warm.
  3. Repeat with battery saver disabled on laptops.
  4. Compare against an upload-first cloud tool on the same network—include upload seconds honestly.

Merchant guidance

  • Batch catalog days: prefer desktop, AC power, updated drivers.
  • Quick social crop on phone: acceptable for drafts, not final hero assets.
  • Do not publish single millisecond marketing claims—variance is huge across devices.

Transparency

See processing speed benchmark, browser compatibility, and GPU topic page.

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