Loading Performance

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1. 1 What's the difference between `async`, `defer`, and a plain `<script>`? Medium
2. 2 What do `preload`, `prefetch`, `preconnect`, and `dns-prefetch` do? Medium
3. 3 What is code splitting, and how do route- and component-level splitting differ? Medium
4. 4 What is tree shaking, and what prevents a module from being shaken out? Medium
5. 5 How do you decide what belongs in the initial bundle vs lazy-loaded chunks? Medium
6. 6 What is a resource hint waterfall, and how do you find the critical request chain? Hard
7. 7 How do you optimize web font loading to avoid FOIT/FOUT? Hard