Tips to make your React apps faster!

Hello everyone, in this blog post, I will share some tips to make your React application faster than you think! By following these best practices, you can significantly improve the performance of your React application while ensuring its scalability and maintainability. Let’s jump right into some great approaches in enterprise applications:

The wonderful use of React.memo

Use React.memo to wrap functional components to prevent unnecessary re-rendering when props remain unchanged.

import React from 'react';

const ChildComponent = React.memo(({ count }) => {
  console.log('Rendered Child');
  return <div>Count: {count}</div>;
});

const ParentComponent = () => {
  const [count, setCount] = React.useState(0);

  return (
    <div>
      <button onClick={() => setCount((p) => p + 1)}>Increment</button>
      <ChildComponent count={count} />
    </div>
  );
};

Properly manage status✅

State promotion: Only place state where needed to avoid redundant state in deeply nested components.

const Child = ({ onIncrement }) => (
  <button onClick={onIncrement}>Increment</button>
);

const Parent = () => {
  const [count, setCount] = React.useState(0);

  const increment = () => setCount((p) => p + 1);

  return (
    <div>
      <h1>Count: {count}</h1>
      <Child onIncrement={increment} />
    </div>
  );
};

Suspense and React.lazy, the power of code splitting

Dynamicly import components and load them only when needed, reducing initial package size.

import React, { Suspense } from 'react';
import Loader from './Loader';

const ProductsList = React.lazy(() => import('./ProductsList'));

const App = () => (
  <Suspense fallback={<Loader />}>
    <ProductsList />
  </Suspense>
);

The importance of Key!

Helps React recognize changes by making all rendered array elements unique.

const ProductsList = ({ products }) => (
  <ul>
    {products.map((p) => (
      <li key={p.id}> - {p.name}</li>
    ))}
  </ul>
);

Virtualization is your good helper

Use virtualization when rendering large amounts of data.

import { FixedSizeList as List } from 'react-window';

const items = Array.from({ length: 1000 }, (_, i) => `Item ${i + 1}`);

const Row = ({ index, style }) => (
  <div style={style}>
    <p>{items[index]}</p>
  </div>
);

const MyList = () => (
  <List height={300} width={300} itemSize={35} itemCount={items.length}>
    {Row}
  </List>
);

Using the above methods, your React app will become super fast, allowing you to stand out and seize more opportunities. Thanks for reading. If this article is helpful to you, please like it!

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