Questions
5 of 5
1How would you go about investigating slow React application rendering?
2What are the most common causes of performance issues in React applications?
3How can you minimize bundle size in React applications?
4What are the performance implications of using third-party libraries like Material-UI or Ant Design?
5Discuss react profiler.
reactreact
Basics
JSX
Virtual DOM
Reconciliation
State and Props
Components
Class Components
Function Components
Lifecycle functions
Code Sharing
Hooks
useState
useReducer
useMemo
useContext
useCallback
useEffect
Custom Hooks
New Hooks
HOC
Refs
Data Sharing
Events
Context API
Redux
Router
CSR-SSR
React APIs
Performance Optimisation
ReactDOM
Strict Mode
Security
05 / 05

Discuss react profiler.

The React Profiler is a powerful tool built into React DevTools that helps developers measure and optimize the performance of React applications by tracking component rendering behavior.

  1. 1

    Records render times: Measures how long components take to render during commits (updates).

  2. 2

    Identifies bottlenecks: Highlights slow or unnecessary re-renders.

  3. 3

    Visualizes rendering: Provides flamegraphs and ranked charts to analyze performance.

  4. 4

    Install React DevTools (browser extension or standalone app).

  5. 5

    Open DevTools (F12), go to the Profiler tab.

  6. 6

    Click the Record button to start profiling interactions.