beasties

Beasties is a developer tool that automatically extracts and inlines the critical CSS needed for above-the-fold content in web apps, then lazily loads the remaining stylesheets to improve initial page load performance. It’s designed for front-end developers and performance engineers who want to optimize Core Web Vitals without manually splitting CSS. The project is interesting because it combines the performance benefits of critical CSS inlining with the convenience of a library that handles the lazy-loading logic, making it easier to achieve fast first paints in modern JavaScript frameworks.