#WebAssembly

WebKit, Google, and Mozilla just released JetStream 3 — the first major overhaul of the benchmark suite since 2019. It drops microbenchmarks in favor of realistic workloads, rewrites WebAssembly scoring, and introduces Dart, Kotlin, and Rust compiled to Wasm.

YC and a16z-backed Rivet built an agent runtime on V8 isolates and WebAssembly that cold-starts in 4.8ms — 92x faster than E2B, at 1/17th the cost. We deeply researched the architecture, the benchmarks, and what it means for every agent framework.

The pure TypeScript NumPy implementation hits a new performance milestone and adds Float16 support, bringing scientific computing in the browser closer to reality.