Rust WebAssembly with SIMD: Client-Side Crypto Acceleration and Real-Time Vector Dot Products
Harnessing 128-bit SIMD intrinsics in WebAssembly to execute local embedding comparisons and ChaCha20-Poly1305 encryption in the browser.
WASM Benchmark Suite
Compare browser WASM execution against native C++ benchmarks
Empirical Analysis & Findings
## Client-Side Vector Computation via Wasm Intrinsics
Executing semantic clustering or encrypted zero-knowledge verification on the client preserves user privacy while offloading compute from backend infrastructure. Compiling Rust with target feature `+simd128` achieves near-native execution performance.
### 1. Vector Dot Product Performance (1536 Dimensions, 10,000 Vectors)
| Implementation | Execution Time (ms) | Speedup vs Baseline | Instruction Set |
|:---------------|:-------------------:|:-------------------:|:---------------:|
| Pure JavaScript (TypedArray loop) | 485 ms | 1.0x | Scalar V8 |
| Standard WebAssembly (Scalar Rust) | 162 ms | 3.0x | WASM Baseline |
| WebAssembly SIMD (`v128.f32x4`) | 42 ms | 11.5x | WASM SIMD128 |
| Native C++ (AVX-512) | 18 ms | 26.9x | Host CPU Native |
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Frequently Asked Questions
What throughput improvement does WASM SIMD deliver for vector similarity math?
128-bit packed float operations (`v128`) process four 32-bit floating-point dot product operations per instruction cycle, yielding a 3.8x speedup over scalar WebAssembly.
Are SIMD WebAssembly instructions universally supported in modern browsers?
Yes. Wasm SIMD is fully standardized and enabled across Chrome, Firefox, Safari, and Edge on both x86_64 and ARM64 architectures.
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