How much faster than JS?

5-15x for 4096+ FFT. 30-50 us vs 200-500 us. With SIMD: additional 2-4x. Enables real-time multi-chain analysis.

WASM in AudioWorklet?

Possible via WebAssembly.instantiate(). Common pattern: WASM in Web Worker to avoid blocking audio thread. AudioWorklet writes SharedArrayBuffer; Worker processes asynchronously.

Rust: compact binaries, zero-cost abstractions, memory safety without overhead, excellent WASM tooling. C/C++ viable but manual memory management increases complexity.

100-500 KB gzipped. Under 100 ms download on broadband. Cached by browser. IndexedDB for offline instant loads.

How much faster than JS?

5-15x for 4096+ FFT. 30-50 us vs 200-500 us. With SIMD: additional 2-4x. Enables real-time multi-chain analysis.

WASM in AudioWorklet?

Possible via WebAssembly.instantiate(). Common pattern: WASM in Web Worker to avoid blocking audio thread. AudioWorklet writes SharedArrayBuffer; Worker processes asynchronously.

Rust: compact binaries, zero-cost abstractions, memory safety without overhead, excellent WASM tooling. C/C++ viable but manual memory management increases complexity.

100-500 KB gzipped. Under 100 ms download on broadband. Cached by browser. IndexedDB for offline instant loads.

WASM for Real-Time Audio DSP — Rust to Browser

WASM DSP — Native Performance in Browser

WebAssembly brings near-native performance to browsers via compiled Rust. For audio DSP, WASM delivers 5-15x faster FFT than JavaScript, enabling real-time spectral analysis, filtering, and parameter extraction directly in the browser without installation.

W3C WebAssembly 2.0W3C Web Audio API

Why WASM

Deterministic, no GC, SIMD. 4096-point FFT: 30-50 us WASM vs 200-500 us JS.

Rust to WASM

wasm-pack --target web. Ownership = no leaks. wasm-bindgen for JS bindings. 100-500 KB output.

DSP Operations

FFT, IIR filters, spectral analysis, Welch's method, windows, RT60, STI, SPL. All on Float32Arrays via SharedArrayBuffer.

Architecture

WASM in Web Worker. AudioWorklet writes SharedArrayBuffer ring. Worker processes, posts to main for Canvas rendering at 30-60 Hz.

SIMD

128-bit: 4 floats simultaneously. 2-4x additional speedup. Chrome/Firefox/Safari support. Threads proposal enables multi-threaded WASM.

Try It Now

Experience WASM-powered DSP

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