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# Bundler benchmark
This is a performance benchmark of the following bundlers:
- Bun
- esbuild
- Parcel 2
- Rollup + Terser
- Webpack
It is an exact copy of [`esbuild`'s benchmark](https://github.com/evanw/esbuild/blob/main/Makefile), aside from the fact that Bun [has been added](https://github.com/colinhacks/esbuild/commit/1b928b7981aa7edfadf77fcf8931bb8d6f38cd96). The benchmark bundles 10 copies of the large [three.js](https://threejs.org/), with minification and source maps enabled.
To run the benchmark:
```sh
$ chmod +x run-bench.sh
$ ./run-bench.sh
```
Various output will be written to the console by each bundler. Scan through the results for lines that look like this underneath each bundler output:
```sh
real <number>
user <number>
sys <number>
```
These lines are generated by the `time` command which is used to benchmark each build.
## Results
The `real` results, as run on a 16-inch M1 Macbook Pro:
| Bundler | Time |
| ------- | ------ |
| Bun | 0.17s |
| esbuild | 0.33s |
| Rollup | 18.82s |
| Webpack | 26.21 |
| Parcel | 17.95s |
|
