- Sass: import only the components you need, instead of the full
bootstrap.scss file. See Bootstrap Customization. - JavaScript: with a bundler, import only the plugins you use:
import { Modal } from 'bootstrap'; - Use the utility API of Sass to remove the utilities you do not use.
- Serve the files with gzip or brotli and a long cache time (a CDN does it).
- A tool that removes the unused CSS (like PurgeCSS) can also help, but test it well.
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