React Performance (Web)
Problem Statement
React performance issues often stem from unnecessary re-renders, unoptimized lists, and expensive computations on the main thread. Understanding React's rendering behavior is key to building performant applications.
Pattern: Memoization
useMemo - Expensive Computations
// ✅ CORRECT: Memoize expensive calculation
const sortedAndFilteredItems = useMemo(() => {
return items
.filter(item => item.active)
.sort((a,
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