profiling-performance

To find the cause of a slow web application, you need CPU profiling to capture real call stacks and timing behavior during sluggish interactions like scrolling or clicking. This isolates expensive functions and blocking synchronous work.

You can profile CPU bottlenecks by recording the running web app in Cursor's built-in browser profiler. Reproduce the sluggish interaction to capture raw CPU samples and summary reports for analysis.

Yes, you can debug unexpected re-renders and layout thrashing by analyzing the captured CPU performance data. The profiling summary highlights these specific expensive functions and blocking synchronous tasks.

This CPU profiling works for any running web application accessible through Cursor's built-in browser. It requires reproducing the sluggish interaction within that environment to capture the necessary CPU samples.

The best way to fix slow scrolling and typing performance is to profile the interactions to find the hottest functions, then apply suggested fixes like memoization, debouncing, Web Workers, lazy loading, or list virtualization.

Your web app feels unresponsive during navigation and clicks due to CPU bottlenecks blocking synchronous work. Profiling the live app captures timing behavior and call stacks to pinpoint the exact expensive functions causing the delay.