LESSON 1.1
Profiling with React DevTools
Learn key techniques and workflows in React Performance Engineering.
12m
advanced
7,420 students
Overview
The profiler records what rendered, how long it took, and why it happened. Reading a flame graph correctly is most of the diagnostic work.
In this lesson you will:
- Record a realistic interaction, not an idle page
- Read the flame graph and the ranked chart
- Turn on "why did this render" to get the cause
Pro Tip
Use caching and revalidation wisely to ensure your app stays fast and data remains fresh without unnecessary requests.