medium
javascript•Jan 8, 2026
Memoization in React: Or How I Thought I Optimized My App (But Mostly Just Felt Productive)
The author's journey to understanding memoization in React, including common misconceptions and how to properly use memoization to improve performance.
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Original source
Key summary
The author shares their experience with optimizing React performance, specifically with memoization. They explore common misconceptions about memoization, such as thinking that memoizing a function or props will prevent re-renders, and demonstrate how to properly use memoization to improve performance.
TL;DR
- A React component re-renders when its parent re-renders.
- useCallback only stabilizes function references, not re-renders.
- Memoizing props without memoizing the component does nothing for re-renders.
- React checks for changes using shallow comparison.
- Memoizing a component only prevents re-renders when props don't change.
- Shallow comparison means React checks for reference changes, not value changes.
- Decorative memo wrappers are common when props don't change.
This content is automatically summarized using AI. For full context, always refer to the original article.
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