Lazy loading routes in Vue - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is lazy loading in the context of Vue routes?

Lazy loading means loading route components only when the user visits that route, not before. This helps make the app faster by not loading everything at once.

beginner

How do you define a lazy loaded route component in Vue Router?

Use a function that returns an import statement, like: <br><code>{ path: '/about', component: () => import('./About.vue') }</code>. This tells Vue to load the component only when needed.

beginner

Why is lazy loading routes beneficial for user experience?

It reduces the initial load time of the app, so users see the page faster. It also saves bandwidth by loading only what is needed.

intermediate

What happens if you don’t use lazy loading for routes in a large Vue app?

All route components load at once, making the app slower to start and use more data upfront, which can frustrate users.

intermediate

Can lazy loading routes affect SEO or accessibility?

Lazy loading routes usually does not affect SEO if server-side rendering is used. For accessibility, ensure loading states are clear and navigation is keyboard-friendly.

How do you write a lazy loaded route in Vue Router?

A { path: '/home', component: () => import('./Home.vue') }

B { path: '/home', component: './Home.vue' }

C { path: '/home', component: import('./Home.vue') }

D { path: '/home', component: function() { return './Home.vue' } }

Option A uses a function returning an import statement, which is the correct lazy loading syntax.

What is the main benefit of lazy loading routes?

A Faster initial app load

B More complex code

C Loads all components upfront

D Slower navigation between pages

Lazy loading improves performance by loading only needed components, making the app start faster.

Which Vue Router version introduced official support for lazy loading routes?

A Vue Router 2

B Vue Router 1

C Vue Router 4

D Vue Router 3

Vue Router 3 introduced the common pattern for lazy loading routes using dynamic imports.

What does the import() function return when used in lazy loading?

A A string path

B A promise that resolves to the component

C The component immediately

D An error

import() returns a promise that loads the component asynchronously.

Which of these is NOT a benefit of lazy loading routes?

A Reduced initial bundle size

B Improved app startup speed

C Automatic SEO optimization

D Lower bandwidth usage on first load

Lazy loading alone does not automatically improve SEO; other techniques like server-side rendering are needed.

Explain how lazy loading routes work in Vue and why they improve app performance.

Think about when components are loaded and how that affects speed.

Describe how you would implement lazy loading for a new route in a Vue app.

Focus on the route object and the component property.