3 Ways to make React app 3-times faster:-

Welcome to this blog post where we will explore how to significantly boost the performance of your React app. By following these tips, we will be able to make our application run up to 3 times faster, providing a smoother user experience and potentially attracting more users.

Use LazyLoading:-

Lazy loading is a powerful technique that can greatly enhance the performance of your React app by loading components or modules only when they are required. By doing so, it reduces the initial bundle size and loading time, as the app doesn't have to load all components at once. Instead, it loads components on-the-fly as users navigate through the application.

To implement lazy loading in your React app, you can use the built-in function called React.lazy()

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

When using React.lazy(), you also need to use the Suspense component to handle the loading state while the lazy-loaded component is being fetched. The Suspense component allows you to show a fallback UI (e.g., loading spinner) until the lazy component is ready to be rendered.

import React, { Suspense } from 'react';

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

function App() {
  return (
    <div>
      <Suspense fallback={<div>Loading...</div>}>
        <MyLazyComponent />
      </Suspense>
    </div>
  );
}

Use Memo:-

You can increase the speed and performance of your React app using the useMemo hook. Memoization allows caching the result of a function and returning the cached result if the input remains the same between renders. This approach is especially useful for optimizing expensive computations or calculations that don't require re-execution during every render.

Imagine you have a function that performs a complex computation, and the result doesn't change unless some specific dependencies change. You can use useMemo to memoize the result and avoid unnecessary re-calculations.

import React, { useMemo } from 'react';

function MyComponent({ data }) {
  const complexResult = useMemo(() => {

    return performComplexComputation(data);
  }, [data]); 

  return <div>{complexResult}</div>;
}

The complex computation will only be re-run if the data prop changes.

Clean/ Remove EventListner :-

Improperly managed event listeners can lead to memory leaks and degrade the performance of a React app.When we add event listeners to elements in our React components, it's crucial to remove those listeners when the component is unmounted or updated to avoid potential memory leaks. Otherwise, the listeners may persist in memory even after the component is no longer in use.

Instead of attaching event listeners directly in your components, use the useEffect hook to add them when the component mounts.

import React, { useEffect } from 'react';

function MyComponent() {
  useEffect(() => {
    const handleScroll = (event) => {

    };

    window.addEventListener('scroll', handleScroll);

    return () => {

      window.removeEventListener('scroll', handleScroll);
    };
  }, []);

  return <div>Component content</div>;
}

By cleaning or removing event listeners properly, we ensure that our React app performs optimally and doesn't suffer from memory leaks caused by lingering event listeners.