useEffect Is Making Your App Slow. Fix it Like This

Get FREE checklist to avoid common useEffect mistakes - https://topmate.io/shrutikapoor08/1774714

Every React developer has blamed useEffect at some point. “It causes re-renders.” “It breaks my app.”

But here’s the truth - useEffect is not bad. Your code is. After reviewing 50 React codebases, I found 16 common useEffect mistakes developers make every single day. From missing dependencies to unnecessary effects, cleanup issues, and performance pitfalls, this video breaks down the real reasons your React apps behave weirdly.

Whether you’re using React 18 or preparing for React 19, understanding how useEffect, useLayoutEffect, and the React Hooks mental model work is critical to building fast, stable apps.

*WHAT YOU'LL LEARN*
The 4 biggest categories of useEffect mistakes:
- Dependency issues, Cleanup bugs, Wrong application, and Abuse (overuse or misuse)
- How to avoid infinite re-renders and memory leaks in React
- The right way to handle async functions, fetch calls, and event listeners inside useEffect
- How useEffectEvent in React 19
- Why many developers use useEffect when they should use useMemo, useCallback, or derived state instead

By the end, you’ll know exactly when to use useEffect, when not to, and how to structure effects to keep your components clean and predictable.

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*RESOURCES MENTIONED*
React Docs on useEffect → https://react.dev/reference/react/useEffect
ESLint Plugin React Hooks → https://www.npmjs.com/package/eslint-plugin-react-hooks
React Compiler → https://react.dev/learn/react-compiler/installation
My React Crash Course → https://youtu.be/X2Rcp87yl4s?si=KDTMltK2XfkIyhoC

*INTERVIEW RESOURCES*
1. Practice JavaScript Interviews: https://www.greatfrontend.com/questions/js?fpr=shruti79
2. React Course for beginners: https://www.oreilly.com/library/view/react-fundamentals-building/0636920981428/

*RECOMMENDED COURSES*
1. React Course for beginners by Shruti Kapoor: https://www.oreilly.com/library/view/react-fundamentals-building/0636920981428/
2. Become a FullStack Developer (20% off via this link): https://scrimba.com/fullstack-path-c0fullstack?via=shrutikapoor

*HELPFUL RESOURCES*
1. Sign Up to stay updated in React and AI: https://bit.ly/shruti-newsletter
2. FREE React Interview Questions Book: https://bit.ly/free-react-guide

*WORK WITH ME*
1. Book 1:1 for Technical Guidance - https://topmate.io/shrutikapoor08
2. Want to do a mock interview? Join our Discord community: http://bit.ly/shruti-discord

*SOCIALS*
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*CHAPTERS*
0:00 Intro
0:27 Why most developers get it wrong
0:59 3 Questions to Ask Before Writing useEffect
2:34 Dependency problems
6:35 CodeRabbit
9:39 Derived state issues
13:16 Missing clean up function
16:43 Wrong application of useEffect hook
20:32 useEffectEvent in React 19
22:28 Summary
DISCLAIMER: Some of the above links may be affiliate links, meaning if you purchase a product or service via these links I may receive a small commission/reward, at no additional charge to you!

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Keywords
react, react hooks, useeffect, useeffect mistakes, react useeffect tutorial, react performance optimization, react useeffect cleanup, react useeffect dependencies, react code review, react 2025, react 19 hooks, useeffect explained, react infinite re-render, react memory leak, useeffect best practices, useeffect vs usememo, react useeffect event, react useeffect async, shruti kapoor react

#reactjs #useeffect #reacthooks #shrutikapoor

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Видео useEffect Is Making Your App Slow. Fix it Like This канала Shruti Kapoor