Bun Outpaces Node.js in 2026 Benchmarks, but Migration Needs Careful Planning

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Bun topped the JavaScript Rising Stars chart in 2025 and has since reached production at a notable number of mid-sized engineering teams by early 2026. Internal benchmarks run in March 2026 on Apple M2 Pro hardware show Bun is up to 10.8x faster than Node 22 LTS for tasks like TypeScript CLI startup, package installs, and test runs. However, the performance gap narrows significantly to around 20-25% for production servers handling real database I/O, where bottlenecks typically lie with Postgres or Redis rather than the runtime itself. Compatibility issues remain concentrated in native modules and less-common Node APIs, meaning teams should pilot Bun before committing any production service. Experts suggest a hybrid approach — using Bun for tooling, scripts, and tests while keeping Node for production servers — as a practical middle ground until dependency compatibility is fully resolved.

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