Aaron Turner (UXE at Google) says “WebAssembly is fast” and has conducted a real-world benchmark between WebAssembly and ES6 to showcase Wasm’s performance on different browsers, devices, and cores.

…this benchmark will be utilizing the WasmBoy benchmarking tool (source code). The benchmark features three different cores as of today. AssemblyScript (WebAssembly built with the AssemblyScript compiler), JavaScript (ESNext output by the TypeScript compiler), and the previous JavaScript core except run through Google’s Closure Compiler…