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Mastering React Rendering Performance with Memoization and Context

Tutorial May 03, 2025

For components that perform heavy computations, useMemo can cache the result of a calculation, recomputing it only when its dependencies change.([Content That Scales][5])

import React, { useState, useMemo } from 'react';

function ExpensiveComponent({ data }) {
  const processedData = useMemo(() => {
    // Expensive computation
    return data.map(item => /* processing */ item);
  }, [data]);

  return <div>{/* render processedData */}</div>;
}

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