Bundle Size

In plain words

Bundle size refers to the combined file size of the JavaScript, CSS, and other assets a browser downloads to load a page. Smaller bundles load faster, which directly improves Core Web Vitals, page speed, and ultimately search rankings and conversion rates.

Example

Removing an unused animation library takes a page's JavaScript from 400 KB to 90 KB, and it becomes interactive about a second sooner on mobile.

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