9 Angular Lazy Loading Secrets That Instantly Cut Your Bundle Size in Half

Coding master

5 min read

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Oct 16, 2025

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This one refactor cut a production bundle from 2.8 MB to 1.3 MB on a real app the page loaded twice as fast and CI tests stopped timing out.

Read this like a senior teammate giving the exact changes that matter. Short, executable patterns. Copy-paste code. Tiny benchmarks you can reproduce. These are practical wins, not academic theory.

Why this matters bluntly

First load time is user trust. Every kilobyte you send slows perception, ad revenue, conversions, and patience. Lazy loading is not a feature toggle. It is a mindset. Adopt these nine secrets and the app will feel smaller, faster, and clearer.

Secret 1 : Split feature modules aggressively, not just routes

Problem
One module with lots of components piles everything into the initial chunk.

Change
Create lightweight feature modules and lazy-load them via the router. Keep shared UI in a small SharedModule.

// app-routing.module.ts
const routes: Routes = [
  { path: 'dashboard', loadChildren: () => import('./dashboard/dashboard.module').then(m => m.DashboardModule) },
  { path: 'settings', loadChildren: ()…