Answer
It recreates component definitions on every render, hurting memoization and performance.
Quick Answer
Styled-components or CSS-in-JS objects defined inside a component are recreated on every render — generating new class names each time. This causes unnecessary style recalculations, can break animations, and adds garbage collection pressure. Define styles outside the component or with stable references at the module level.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ