Why Code splitting and lazy loading in Remix? - Purpose & Use Cases

The Big Idea

Discover how loading less code upfront can make your app feel lightning fast!

The Scenario

Imagine building a big website where every page loads all the code at once, even parts users might never visit.

This makes the site slow to start and frustrating to use.

The Problem

Loading all code upfront wastes time and data.

Users wait longer, especially on slow connections.

It also makes updates harder because everything is bundled together.

The Solution

Code splitting breaks your app into smaller pieces that load only when needed.

Lazy loading delays loading parts until the user actually needs them.

This speeds up initial load and saves data.

Before vs After

✗ Before

import BigComponent from './BigComponent';
function App() {
  return <BigComponent />;
}

✓ After

import React from 'react';
const BigComponent = React.lazy(() => import('./BigComponent'));
function App() {
  return <React.Suspense fallback={<div>Loading...</div>}><BigComponent /></React.Suspense>;
}

What It Enables

This lets your app start fast and load features only when users want them, improving experience and saving resources.

Real Life Example

Think of an online store where product details load only when you click a product, not when you open the homepage.

Key Takeaways

Loading all code at once slows apps down.

Code splitting breaks code into smaller chunks.

Lazy loading loads chunks only when needed, making apps faster and lighter.