Explanation

Answer Example

I would start by profiling the webpage using tools like Chrome DevTools or Lighthouse to identify the root causes of poor performance. For excessive DOM elements, I’d reduce HTML complexity by refactoring unnecessary wrappers and merging redundant elements. Virtual DOM libraries like React can also help manage updates more efficiently. For heavy JavaScript execution, I’d analyze the critical path and split long-running tasks using techniques like requestAnimationFrame or web workers to prevent blocking the main thread. Lazy loading assets such as images and scripts can further enhance performance. For example, in a previous role, I reduced page load times by 30% by restructuring the DOM and implementing code-splitting for JavaScript bundles.