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Google Lighthouse is an open-source, automated tool for measuring the quality of web pages. ... audits performance, accessibility, and search engine optimization factors of web pages

https://en.wikipedia.org/wiki/Google_Lighthouse

Hackernews: why are websites nowadays so bloated and slow??

Also hackernews: what's Lighthouse?

Sale here.

From https://developer.chrome.com/docs/lighthouse/overview/

> Lighthouse is an open-source, automated tool for improving the quality of web pages. [...] It has audits for performance, accessibility, progressive web apps, SEO, and more

It's shame it is ESM only package now for Node.js. Forces you to rewrite your tests to be able to use the latest version.

For that I would suggest something like this: https://www.npmjs.com/package/commonjs-to-es-module-codemod.