Diagnose React runtime performance

Measure one reproducible interaction, connect browser work to React renders, and report only conclusions supported by the trace.

Define the interaction

Before recording:

1. Identify the target URL
2. Write the exact actions to reproduce
3. Choose the expected result
4. Confirm whether authentication is required

Use a production build when available. Development builds add framework work that can distort render and script timings. If you must measure a development build, label that limitation in the report.

Record the trace

Run the scan in an interactive terminal: