GoKawiilWasmi 2.0 ships with 2.2x faster WebAssembly interpretation
The Wasmi project released version 2.0 after eight months of development, delivering roughly 2.2x faster execution than Wasmi 1.0 based on geometric mean results across its benchmark suite on an Apple M2 Pro. The update also adds a validate crate feature to shrink binary size, stable fuel metering, support for WebAssembly's deterministic profile, and an improved CLI tool. The release was sponsored by the Stellar Development Foundation and benchmarked against rival interpreters Wasm3 and Stitch across multiple CPU architectures.
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Wasmi powers IoT devices, plugin systems, cloud platforms, and smart contract runtimes like Soroban and Ripple, so faster execution directly improves performance and cost efficiency for these downstream applications. Comparing it head-to-head against Wasm3 and Stitch on different hardware highlights how interpreter choice can vary depending on deployment architecture, a key consideration for teams embedding WebAssembly at the edge or in constrained environments.
- Wasmi 2.0 runs about 2.2x faster than version 1.0 in geometric mean benchmarks.
- New features include a smaller binary footprint, stable fuel metering, and deterministic profile support.
- Performance was benchmarked against Wasm3 and Stitch across Apple, AMD, and Intel hardware.
Rust Atomics and Locks by Mara Bos — Wasmi is written in Rust, and squeezing out 2.2x interpreter speedups is exactly the kind of low-level work this book prepares you for. Mara Bos walks through Rust's memory model, concurrency primitives, and how to build your own, which is great background for anyone digging into engine internals like these.
See Rust Atomics and Locks by Mara Bos on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: wasmi-labs.github.io — Robin Freyler, 2026-09-01
Published there as: “Engineering of the fastest WebAssembly interpreters”
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