🦁 Which JavaScript engine is the fastest?
JavaScript Engines Zoo is an open-source tool that compares dozens of JS engines across multiple architectures (amd64 and arm64), showing speed, binary size, codebase size, JIT support, and ECMAScript compatibility.
⚡ Notable results:
- 🥇 JavaScriptCore (Safari/WebKit’s engine) frequently outperforms V8 in benchmarks
- 🚀 Meta’s static Hermes performs very well without JIT on Apple Silicon — ideal for mobile apps
- 🐌 SpiderMonkey (Firefox) trails in several benchmarks, surprising many
🔍 What you can compare:
- Execution speed per benchmark
- Engine binary size
- ECMAScript feature support
- JIT vs. JITless configurations
💡 The HN thread conclusion: JS speed stopped being the differentiating factor long ago. Today bugs, extensions, and the ecosystem matter more than microseconds of execution.
Quick explanation#
A JavaScript engine is the program that runs your JS code. Browsers and runtimes (Node.js, Deno, Bun) use different engines. This site puts them all in a table for objective comparison — like a zoo where each animal is a different engine.
More information at the link 👇
Also published on LinkedIn.
