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profiling-performance

Profile a running web application's CPU performance using Cursor's built-in browser profiler. Captures call stacks, identifies slow functions, and suggests optimizations. Use when a page feels slow or janky.

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# Performance Profile

Use this skill when a web application feels slow, janky, or unresponsive. Cursor's built-in browser has CPU profiling tools that capture real call stacks and timing data.

## How It Works

The `cursor-ide-browser` MCP provides `browser_profile_start` and `browser_profile_stop` tools that capture Chrome DevTools-format CPU profiles. Profile data is written to `~/.cursor/browser-logs/` as both raw JSON and a human-readable summary.

## Steps

1. **Ensure the app is running** — start the dev server if it isn't already running.

2. **Navigate to the slow page**: