chore: upgrade Docusaurus, enable Faster - Rspack/SWC/LightningCSS

[slorber]

Docusaurus v3.6 had Docusaurus Faster options.

I'm testing it on a few sites before the release.

Benchmark

Cold builds - much faster:

hyperfine --prepare 'yarn --cwd website clear' --runs 3 'DOCUSAURUS_FASTER=false yarn build:docusaurus' 'DOCUSAURUS_FASTER=true yarn build:docusaurus'


Benchmark 1: DOCUSAURUS_FASTER=false yarn build:docusaurus
  Time (mean ± σ):     26.333 s ±  0.075 s    [User: 67.591 s, System: 7.877 s]
  Range (min … max):   26.248 s … 26.388 s    3 runs

Benchmark 2: DOCUSAURUS_FASTER=true yarn build:docusaurus
  Time (mean ± σ):      8.062 s ±  0.348 s    [User: 15.819 s, System: 1.906 s]
  Range (min … max):    7.660 s …  8.272 s    3 runs

Summary
  DOCUSAURUS_FASTER=true yarn build:docusaurus ran
    3.27 ± 0.14 times faster than DOCUSAURUS_FASTER=false yarn build:docusaurus

Warm rebuilds - same time (for now):

DOCUSAURUS_FASTER=false yarn build
hyperfine --runs 3 'DOCUSAURUS_FASTER=false yarn build:docusaurus' 'DOCUSAURUS_FASTER=true yarn build:docusaurus'


Benchmark 1: DOCUSAURUS_FASTER=false yarn build:docusaurus
  Time (mean ± σ):      7.934 s ±  0.356 s    [User: 10.059 s, System: 1.205 s]
  Range (min … max):    7.727 s …  8.345 s    3 runs

  Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.

Benchmark 2: DOCUSAURUS_FASTER=true yarn build:docusaurus
  Time (mean ± σ):      8.119 s ±  0.549 s    [User: 15.756 s, System: 1.909 s]
  Range (min … max):    7.656 s …  8.725 s    3 runs

Summary
  DOCUSAURUS_FASTER=false yarn build:docusaurus ran
    1.02 ± 0.08 times faster than DOCUSAURUS_FASTER=true yarn build:docusaurus

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[slorber]

Just realized I'm upgrading the Babel website to use SWC 😅 hope you are fine with this

[slorber]

PR ready to review @nicolo-ribaudo, v3.6 is out:
https://docusaurus.io/blog/releases/3.6

[JLHwung]

@slorber Thank you for the PR. Will docusaurus 4 remove this option and completely switch to Rspack/SWC/LightningCSS?

[slorber]

👍

I think we'll keep it for v4, but maybe it will become true by default.

It's also possible to enable all the other options except replacing Babel loader by SWC if you really want your site to use Babel.

Note: if you want to keep Babel, we have a {webpack: {jsLoader: fn}} hook to plug your own custom loader. Even if we remove the faster options and make SWC the default, this hook remains an escape hatch to use Babel, OXC, Esbuild, or whatever you want.

[nicolo-ribaudo]

I'm personally fine with using SWC, as long as there is an opt out if we'll ever need it.

[nicolo-ribaudo]

Nice numbers :)

[slorber]

Thanks 🥳

Wasn't that long before but still cool to see the overall build time reducing