Cut styled-components into pieces: This is our last resort

Styled-components, a popular library for styling React applications, has faced a performance issue due to not implementing React 18's `useInsertionEffect` hook, designed to optimize CSS-in-JS performance. With the library's maintainer, Evan Jacobs, announcing its maintenance mode and advising against new projects using styled-components, existing applications like those at Sanity and Linear faced performance challenges. Sanity addressed this by forking the library and implementing the necessary optimizations, achieving up to 40% faster initial component rendering. The fork, which embraces React 19's architecture and improves streaming SSR, is a temporary solution to help teams maintain performance while planning migrations to modern styling solutions. This effort underscores the challenges and community-driven support within open-source projects, offering a bridge for teams to transition without immediate rewrites.

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