What are the biggest changes in styled-components 6.4?

RSC stable, smarter caching for 3.5x speedups, React Native v4 support, better CSP and themes.

How do I avoid hydration issues with styled-components 6.4 RSC?

Keep components server-safe—no hooks, browser APIs. Sync server/client data exactly.

Is styled-components 6.4 worth upgrading for performance?

Yes if you optimize cache and test rigorously; otherwise, stick to 6.3 to avoid bloat.

Styled-Components 6.4: 3.5x Speedups Sound Great, But Here's the Real Cost

A claimed 3.5x speedup in style generation? Sounds like catnip for React devs. But after 20 years watching CSS-in-JS hype cycles, I've seen these 'transformative' updates bite back hard.

theAIcatchup Apr 10, 2026 4 min read

⚡ Key Takeaways

3.5x style speedups via caching demand consistent props or suffer misses. 𝕏
RSC stable now, but hydration mismatches kill if not server-safe. 𝕏
React Native and CSP gains help cross-platform, but overrides needed. 𝕏

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theAIcatchup

Community-driven. Code-first.

#CSS-in-JS #CSS-in-JS performance #React Native #React Native styling #React Server Components #performance optimization #styled-components #styled-components 6.4

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Originally reported by Dev.to

⚡ Key Takeaways

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