Have you ever debugged performance issues? Do you understand how to do it?

Yes, I have optimized frontend performance. The main steps to improve performance include:

• Using browser tools (Chrome DevTools, Lighthouse) to analyze page load, response time, and rendering.
• Optimizing resource loading: minification, compression, lazy loading.
• Caching data and static assets.
• Optimizing DOM manipulation: minimizing reflows and style recalculations.
• Analyzing and optimizing JavaScript code: reducing blocking operations, using asynchronous techniques.

For example: with Chrome DevTools, you can view the Performance tab, record a session, and see which operations take the most time, then optimize the bottlenecks.