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I never tested myself tbh, but that’s a surprising result as on production you only have plain old CSS https://github.com/callstack/linaria/blob/master/docs/HOW_IT_WORKS.md The styled syntax should be extracted the same way as the css helpers. I’m not sure if under some condition the styles get inlined? Perhaps on dev env?
In React 18 and onwards runtime css-in-js libs will have significant performance issues for concurrent rendering, recomputing inline styles repeatedly and redundantly; https://github.com/reactwg/react-18/discussions/110 . Facebook have no real interest into fixing this I believe (I assume it would be hard with unwanted trade-offs). Facebook themselves use a buildtime css-in-js lib(not open source).