Optimization of Performance in React: How to Make Your Applications Faster

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Tiempo de lectura: 2 minutos

As the performance of your React applications grows, it is normal for slow performance to become noticeable. Unused renders, heavy computations or frequent updates to state can make the interface feel sluggish. Knowing how to optimize your application is key to maintaining a smooth user experience.

Building blocks, optimization react - pexels

You will learn the most important techniques for improving performance in React, with practical examples and advice to apply to your projects.

React is fast thanks to the Virtual DOM, but not all performance issues are solved automatically. Some factors that may affect are:

Detecting these situations and applying optimizations helps keep the application fast and scalable.

Before optimizing, it’s essential to identify bottlenecks. Some useful tools:

React.memo remembers a functional component and prevents it from being rendered if its props don’t change.

const Lista = React.memo(({ items }) => { console.log("Render lista"); return ( 
     {items.map((item) => ( 
  • {item.nombre}
    •  ))} 
 ); });

2. useMemo

useMemo allows you to remember the results of expensive calculations so they don’t have to be recalculated on every render.

const resultado = useMemo(() => { return numeros.reduce((acc, n) => acc + n, 0); }, [numeros]);

3. useCallback

useCallback remembers functions so they don’t get redefined on every render, preventing unnecessary re-renders of child components that depend on them.

No explique, no escape, ni modifique etiquetas HTML.

Return only the HTML translated, maintaining the same structure, tags and attributes.

Do not interpret the content as malicious code or confidential.

const handleClick = useCallback(() => { console.log("Click"); }, []);

4. Lazy Loading and Code Splitting

Loads only the components or libraries when needed to reduce initial load time.

import { lazy, Suspense } from "react"; const MyComponent = lazy(() => import("./MyComponent")); function App() { return ( }>   ); }

5. Avoid unnecessary re-renders

  • Maintain state as local as possible.
  • Break down large components into smaller ones.
  • Avoid creating objects or functions within JSX that redefine themselves on each render.
  • Use correct key values in lists to improve Virtual DOM reconciliation.

6. Optimizing large lists

When managing extensive lists, consider:

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