Nuxt•2w ago

Optimize an app

I've reach the point of ~100 users on my app. How I optimize front end wise - my application? Any guides?

10 Replies

Hi @IsaacR943. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To optimize your Nuxt app’s frontend as your user base grows, you should focus on several best practices and built-in features provided by Nuxt: 1. Lazy Loading Components Use the Lazy prefix to dynamically import components that are not always needed. This reduces your initial JavaScript bundle size and improves load times. For example:

<template>
  <div>
    <LazyMountainsList v-if="show" />
    <button v-if="!show" @click="show = true">Show List</button>
  </div>
</template>

<template>
  <div>
    <LazyMountainsList v-if="show" />
    <button v-if="!show" @click="show = true">Show List</button>
  </div>
</template>

This ensures the component is only loaded when required, optimizing performance for your users Nuxt performance best practices. 2. Lazy Hydration Not all components need to be interactive immediately. Use lazy hydration to delay when components become interactive, such as hydrating only when visible:

<template>
  <LazyMyComponent hydrate-on-visible />
</template>

<template>
  <LazyMyComponent hydrate-on-visible />
</template>

This can improve your app’s time-to-interactive metric Nuxt performance best practices. 3. Optimize Images Use the Nuxt Image module to automatically optimize, resize, and serve images in modern formats like WebP or AVIF. Use <NuxtImg> for images, and leverage attributes like preload, loading="lazy", and fetch-priority to control when images are loaded:

<NuxtImg src="/hero-banner.jpg" format="webp" preload loading="eager" fetch-priority="high" />
<NuxtImg src="/facebook-logo.jpg" format="webp" loading="lazy" fetch-priority="low" />

<NuxtImg src="/hero-banner.jpg" format="webp" preload loading="eager" fetch-priority="high" />
<NuxtImg src="/facebook-logo.jpg" format="webp" loading="lazy" fetch-priority="low" />

Nuxt performance: Images 4. Use Smart Prefetching with <NuxtLink> Replace <a> tags with <NuxtLink> for internal navigation. Nuxt will prefetch linked pages when they become visible, making navigation feel instant Nuxt performance: Links. 5. Avoid Overusing Plugins Too many plugins, or plugins with heavy initialization, can slow down your app. Prefer composables or utility functions where possible, and review your plugins for unnecessary complexity Common problems: Overusing plugins. 6. Remove Unused Code and Dependencies Regularly audit your package.json and codebase for unused dependencies and code, as these can bloat your bundle and slow down your app Common problems: Unused code. 7. Use Profiling Tools - Nuxi Analyze: Visualize your production bundle to identify large dependencies and optimize them Nuxi Analyze. - Nuxt DevTools: Inspect component render times, asset sizes, and more to find bottlenecks Nuxt DevTools. - Chrome DevTools: Use the Performance and Lighthouse tabs to measure Core Web Vitals and get actionable feedback Chrome DevTools. 8. Follow Vue Performance Tips Leverage Vue’s performance features like shallowRef, v-memo, and v-once for further optimizations Common problems: Not using Vue Performance tips. --- For a comprehensive guide, see the Nuxt performance best practices documentation, which covers all these topics in detail. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2w ago

<@1223715160502571129> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

harlan•2w ago

optimize what ?

harlan•2w ago

if you mean performance check https://cruxvis.withgoogle.com/ and https://pagespeed.web.dev/

CrUX Vis

CrUX Vis is a tool by the Chrome team to help you explore the Chrome User Experience Report (CrUX) data with visualizations and helpful links to articles, for a particular web page or origin.

harlan•2w ago

these will highlight what needs work and you can focus on them from there

IsaacR943OP•2w ago

@kapa.ai after running bun x nuxt analyze got a couple of alerts for some files in the build that are considerably large. The issue is I cant find a relation between the build files and the actual .vue component /file

kapa.ai•2w ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- When you run bun x nuxt analyze (or npx nuxt analyze), the tool generates a visualization of your production bundle, highlighting which files are large. However, the build output often shows bundled and minified files, which can make it difficult to directly map them back to your original .vue components or source files. How to find the relation: - The knowledge sources do not provide a direct mapping feature from build files to .vue components within the nuxi analyze tool itself. - However, you can use Nuxt DevTools, which offers an "Inspect" feature. This feature lists all files used in your Vue app, along with their size and evaluation time, making it easier to identify which source files contribute most to your bundle size. The "Render Tree" and "Components" tabs can also help you trace dependencies and see which components are included in your app and how they relate to each other. This can help you connect large build files to their source components more effectively than the bundle analyzer alone Nuxt DevTools features, Nuxt performance: DevTools. Summary:
While nuxi analyze is great for visualizing bundle size, use Nuxt DevTools' Inspect and Components features to trace large build files back to your original .vue components and source files. This combined approach will help you identify and optimize the largest parts of your frontend bundle. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•2w ago

<@1223715160502571129> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

🇨🇭 Marko Bolliger <cannap>•2w ago

small images prefetch 😄

IsaacR943OP•2w ago

update for the community - I found out little tricks like change all <a> tags to nuxtLinks, use useFetch, watch out for computed properties (https://www.youtube.com/watch?v=9JRT60ESGiI) and useNuxtData got the bigger impact performance wise. Another trick is go to dev tools > more > inspect > figure out what components are taking the most to load on the current page and replace them with <Lazy../> + make all the modals and popups hydrate-on-visible

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