Question 1

Key Vue 3 performance techniques?

Accepted Answer

v-once/v-memo, shallow refs, computed caching, virtualize lists, async components, avoid unnecessary watchers. Profile with DevTools. Optimize update scope, not just initial load.

Question 2

Why can huge reactive objects be costly?

Accepted Answer

Deep proxies and dependency tracking overhead; prefer shallow + immutable replace for big blobs. Normalize data. Don't make everything reactive.

Question 3

List rendering performance tips?

Accepted Answer

Stable keys, virtual scroll, avoid heavy work in templates, use computed filters. Split row components. Memoize expensive cells with v-memo when appropriate.

Question 4

How does Vite help Vue app performance in practice?

Accepted Answer

Fast HMR/dev, efficient bundling/code-split with dynamic import. Still own route-level splitting and asset strategy.

Question 5

Avoiding unnecessary component updates?

Accepted Answer

Keep props stable, use computed, check parent render churn, consider v-memo. Don't overuse functional micro-optimizations without metrics.

Question 6

SSR/SSG performance considerations for Vue?

Accepted Answer

Cache rendered pages, stream when available, hydrate efficiently, avoid blocking setup. Frameworks like Nuxt provide patterns—know your stack.

Question 7

Images and fonts in Vue SPAs?

Accepted Answer

Lazy-load, correct sizes, modern formats, font-display strategies. LCP often dominated by media, not Vue runtime.

Question 8

Lead: performance culture on a Vue team?

Accepted Answer

Budgets, RUM, PR checklist for lists/reactivity, shared virtualization utilities. Teach shallowRef/markRaw patterns for chart libs.

Performance Vue.js Interview Questions

Other Vue.js interview topics