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feat(core): faster JS minimizer - siteConfig.future.experimental_faster.swcJsMinimizer #10441

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merged 5 commits into from
Aug 23, 2024

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@slorber slorber commented Aug 23, 2024

Docusaurus Faster

This PR is part of the Docusaurus Faster project aiming at reducing production build times

Motivation

Add experimental swcJsMinimizer option to make js minification faster.

It turns out terser-webpack-plugin default minimizer is slow and a real bottleneck representing 20-30% of total build time!

The plugin offers an option to use a swc-based minimizer instead, which you can now toggle thanks to a new feature flag siteConfig.future.experimental_faster.swcJsMinimizer

Time to minimize JS on our website:

  • Before: 18s
  • After: 3s 🔥

I'm not sure the options are ideal, but I was conservative and only used a different tool with similar options, instead of fine-tuning the existing options. We

Note: in the future we'll be able to use the built-in Rspack swc minimizer plugin (even faster, no extra JS<->Rust cost)

Test Plan

CI

Test links

https://deploy-preview-10441--docusaurus-2.netlify.app/

@slorber slorber added the pr: new feature This PR adds a new API or behavior. label Aug 23, 2024
@facebook-github-bot facebook-github-bot added the CLA Signed Signed Facebook CLA label Aug 23, 2024
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⚡️ Lighthouse report for the deploy preview of this PR

URL Performance Accessibility Best Practices SEO Report
/ 🟠 88 🟢 98 🟢 96 🟢 100 Report
/docs/installation 🟠 53 🟢 97 🟢 100 🟢 100 Report
/docs/category/getting-started 🟠 74 🟢 100 🟢 100 🟠 86 Report
/blog 🟠 67 🟢 96 🟢 100 🟠 86 Report
/blog/preparing-your-site-for-docusaurus-v3 🔴 48 🟢 92 🟢 100 🟢 100 Report
/blog/tags/release 🟠 68 🟢 96 🟢 100 🟠 86 Report
/blog/tags 🟠 74 🟢 100 🟢 100 🟠 86 Report

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github-actions bot commented Aug 23, 2024

Size Change: -10 kB (-0.09%)

Total Size: 11.6 MB

Filename Size Change
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