Check Your Vue.js App Speed
Run a Lighthouse audit on your Vue.js application and export the full JSON report. Use it with ChatGPT, Claude, or Cursor to fix bundle issues, hydration mismatches, and Core Web Vitals problems in Vue.
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Loading...Common performance issues on Vue sites
These are the issues most frequently found in Vue Lighthouse audits. Your report will tell you exactly which ones apply to your site.
Large JavaScript bundle from synchronous imports
Vue apps that import all components synchronously produce large bundles. The "Reduce unused JavaScript" audit identifies which imports to convert to defineAsyncComponent() or route-level lazy imports.
Poor LCP from client-side rendering
Vue SPA (without Nuxt or SSR) renders nothing until the JavaScript loads and executes. The result is LCP often exceeding 4 seconds on average connections.
Layout shift from async component loading
When async components load in, they can shift existing content if the container has no reserved dimensions — a common source of high CLS in Vue apps.
Vue Router navigation blocking main thread
Complex navigation guards or synchronous data fetching on route change can create long tasks that block the main thread and increase TBT.
Pro tip: Use Nuxt.js instead of plain Vue for automatic SSR, route-based code splitting, and built-in image optimization. If you must use plain Vue, add @vue/server-renderer for SSR and vite-plugin-vue-package-size-analyzer to identify bundle bloat.
Want a detailed tutorial? Read our step-by-step performance fix guide →
Frequently asked questions
How do I check my Vue.js site speed?
Enter your Vue.js app URL at speedexporter.com and run a free Lighthouse audit. Vue SPAs have predictable performance patterns — the report will identify large synchronous imports, client-rendering LCP delays, and missing resource hints that are common to most Vue applications.
What causes slow LCP in Vue.js apps?
Vue SPAs without SSR render nothing until JavaScript loads and executes, typically delaying LCP beyond 4 seconds on mobile. Common Vue-specific causes beyond that include large synchronous component imports (use defineAsyncComponent), layout shifts from async component loading in containers without reserved dimensions, and Vue Router navigation guards that run expensive synchronous logic.
How do I pass Core Web Vitals with Vue.js?
If using a plain Vue SPA, migrate to Nuxt.js for SSR and automatic route-based code splitting — this is the highest-leverage single change for LCP. If you stay with Vue SPA, convert heavy components to defineAsyncComponent(), add skeleton screens to prevent CLS from async loads, and use vite-plugin-vue-package-size-analyzer to identify large bundle contributors. Export your Lighthouse JSON and paste it into Claude for component-level recommendations.