Identifying performance bottlenecks and memory leaks in JavaScript applications requires a strategic approach using advanced debugging and profiling techniques. Start with profiling tools like Chrome DevTools’ Performance tab or Firefox Profiler to analyze CPU usage, rendering performance, and JavaScript execution times. Flame charts within these tools visualize where delays occur, aiding in pinpointing inefficient code blocks.

For memory leaks, use heap snapshots in DevTools or Firefox Memory tools to monitor memory usage over time. Look for objects that accumulate and aren’t garbage collected, indicating potential leaks. Address DOM leaks by ensuring proper cleanup of event listeners and unused DOM elements.

Advanced techniques include CPU profiling with console.profile() in Chrome or console.profile() in Firefox to capture detailed function-level CPU performance data. Analyze retained heap sizes to identify objects consuming excessive memory. Implementing RAF for animations ensures smooth rendering by synchronizing with the browser’s repaint cycle, avoiding performance hiccups.

Regular benchmarking and optimization based on profiling results are crucial. Utilize memory leak detection libraries and manual code inspection to catch issues early. By combining these methods, developers can effectively diagnose and resolve performance bottlenecks and memory leaks, enhancing the overall responsiveness and stability of JavaScript applications.