Performance of WebAssembly runtimes
SMRTR summary
A multi-year benchmark tracks WebAssembly runtime performance using libsodium crypto code across 2024, 2025, and 2026 releases. Wasmtime improved steadily, Bun made a dramatic leap, and Wasmer with wide_arithmetic instructions hit just 1.33x native speed. The wide_arithmetic WebAssembly feature proved the biggest single performance unlock for crypto workloads, while runtime choice still causes a 6x spread in results.
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