Runtime & Rendering Performance

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1. 1 What is layout thrashing, and how do you batch reads/writes to avoid it? Medium
2. 2 How does virtualization (windowing) make long lists fast, and what are its trade-offs? Medium
3. 3 What causes a slow, janky scroll, and how do you profile it? Medium
4. 4 How do `useMemo`/`useCallback` help and hurt performance in React? Medium
5. 5 How do you find and fix an unnecessary re-render? Medium
6. 6 What is the difference between debouncing and throttling, and give a use case for each? Medium
7. 7 How would you keep a UI responsive while doing heavy computation? Hard