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React performance can be optimized using:

1. useMemo: Memoize expensive calculations
2. useCallback: Memoize function references
3. React.memo: Prevent unnecessary re-renders
4. Code splitting: Lazy load components

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

// Memoized component
const ExpensiveComponent = memo(({ data }) => {
  const processedData = useMemo(() => {
    return data.filter(item => item.active)
               .map(item => ({ ...item, processed: true }));
  }, [data]);
  
  return 
{JSON.stringify(processedData)}
;
});

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