Bun vs Node.js: A Realistic Comparison in 2026

I've seen plenty of benchmarks showing Bun is fast

Twitter is full of benchmarks like "Bun is 3x faster than Node.js." HTTP server benchmarks, bundling speed, package install speed. Every graph shows Bun winning.

But benchmarks and actual production are different. So I tried it myself. Migrated a side project API server from Node.js 22 to Bun 1.2.

Package installation is definitely faster

npm install took 47 seconds; bun install took 3 seconds. The difference is genuinely felt. It showed up in CI too. The package install step went from 45 seconds to 4 seconds.

But the lock file is different. It uses bun.lockb instead of package-lock.json. If only some people on a team use Bun, the lock files conflict. This turns out to be a bigger deal than expected.

Runtime speed wasn't as dramatic as I hoped

In simple HTTP benchmarks, Bun is 2-3x faster. But in a real API server doing DB queries and business logic, the gap narrows. Most of the time is spent on network I/O and the database anyway.

On my side project, average response time was 182ms on Node.js and 156ms on Bun. About 14% improvement. A far cry from the 3x I saw in benchmarks.

(Honestly, would a user even notice the difference between 182ms and 156ms?)

Ran into compatibility issues

Most npm packages work fine on Bun. But packages with native bindings caused trouble. sharp (image processing) wouldn't install at first. Took 30 minutes digging through Bun's issue tracker to find a fix.

There were also subtle behavioral differences with some node: prefixed built-in modules. crypto.randomUUID() worked, but crypto.createCipheriv() handled options differently.

These compatibility issues are fine for a side project. If they hit in a production service, responding is a lot harder.

Bun as a bundler

I tried Bun's built-in bundler too. It was as fast as esbuild with simpler configuration. But the plugin ecosystem is still too thin for production use. Compared to the rich plugin libraries of webpack or Vite, it has a long way to go.

Verdict as of March 2026

For personal projects, scripts, and CLI tools, Bun is worth using. The package install speed alone is a big DX win. But for team projects or production services, Node.js is still the safer bet. The time spent debugging compatibility issues costs more than the performance gains.

This could change in a year. Bun is moving fast. But if you ask me whether I'd put it in production right now, my answer is not yet.