React Performance Anti-Patterns: 5 Mistakes That Kill Your App's Speed!
Source: Dev.to
Is your React app dragging its feet, but you can’t pinpoint the cause?
You might think you’re following the best practices, but some common development patterns are actually degrading your app’s performance behind the scenes.
In this article, we’ll uncover 5 sneaky anti‑patterns that are silently killing your React app’s speed, and show you how to fix them for a faster, smoother user experience.
1. Context Causing Mass Re‑renders
The Problem
Adding everything in a single context.
The Solution
Split contexts by concern.
2. Inline Object/Array Creation in Props
The Problem
Passing inline objects/arrays as props to a component.
First Solution
Define constants outside the component.
Second Solution
Use useMemo for dynamic values.
3. Rendering Everything in a Huge List
The Problem
Displaying the entire list at once.
The Solution
Use React Window or React Virtualized to virtualize the list.
4. Not Memoizing Expensive Calculations
The Problem
Calculating values during rendering.
The Solution
Wrap the calculation in useMemo.
5. Anonymous Functions in JSX
The Problem
Creating new functions on every render.
The Solution
Use event delegation or memoize callbacks with useCallback.
