JavaScript Performance Execution, Memory, and Profiling Questions

Understand JavaScript execution time and how to profile JavaScript performance using DevTools. Identify and optimize long-running JavaScript tasks (use requestAnimationFrame, break into smaller tasks, use Web Workers for heavy computation). Understand memory leaks - what causes them and how to debug them using heap snapshots. Optimize event handlers - use event delegation, debounce/throttle expensive handlers. Understand the cost of different operations - DOM manipulation is expensive, layout thrashing should be avoided. Discuss minification, tree-shaking, and dead code elimination. Know about JavaScript bundling and how to minimize bundle size.