What are the performance benchmarks for Bun's bundler against other bundlers

Performance Benchmarks

- Bun vs. esbuild: Bun is 1.75 times faster than esbuild.

- Bun vs. Parcel 2: It is 150 times faster than Parcel 2.

- Bun vs. Rollup + Terser: Bun outperforms Rollup + Terser by 180 times.

- Bun vs. Webpack: It is reported to be 220 times faster than Webpack[1][3][5].

These benchmarks were derived from tests that involved bundling multiple copies of the three.js library, including sourcemaps and minification processes, showcasing Bun's efficiency in handling complex bundling tasks[2][3].

Key Features Contributing to Performance

1. Native Implementation: Bun's bundler is built using Zig, which allows for efficient memory management and execution speed.

2. Optimized for Bun Runtime: The bundler generates pre-transpiled files that are specifically optimized for Bun's runtime, reducing the need for redundant transpilation[1][3].

3. Unified Plugin API: This allows plugins to enhance both the bundler and the runtime capabilities, facilitating faster plugin execution through a lightweight process[3].

4. Standalone Executables: The ability to create self-contained executables from TypeScript and JavaScript scripts contributes to its performance benefits[1][3].

Conclusion

Overall, Bun's bundler stands out in the JavaScript ecosystem for its speed and efficiency, significantly outperforming established tools like esbuild, Parcel, Rollup, and Webpack. These performance advantages make it a compelling option for developers looking to streamline their build processes and improve application performance[1][5].