Performance mindset

Last reviewed May 28, 2026 Content v20260528

Track mode

client_vue

Means

In-browser Vue TS

Reading

~1 min

Level

advanced

This lesson

This lesson teaches Performance mindset: the concepts, APIs, and habits you need before advancing in Vue.

Forms are where UX and validation meet—controlled inputs are the React default for predictable state.

You will apply Performance mindset in contexts like: Login forms, filters, wizards, and settings panels with two-way binding.

Write TypeScript, click Run—Vue 3 loads from CDN with the template compiler, mountApp shows UI in #app, and printOutput feeds the terminal.

When hooks, state, and effects from intermediate lessons are familiar.

Vue 3’s reactivity is efficient for most dashboards, but performance work still starts with measurement—Vue DevTools, browser Performance tab, Lighthouse—not premature micro-optimizations.

Common real issues

Huge lists rendered without virtualization
Expensive computed chains recomputing on unrelated state changes
Watchers refetching on every keystroke without debounce
Deep provide/inject objects recreated every render

Fix order

Reduce work (paginate, lazy-load routes)
Split components so only subtrees re-render
Memoize with computed and stable references
Virtualize long lists (vue-virtual-scroller, etc.)

Self-check

When is v-memo worth considering?
Why profile before adding debounce everywhere?

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Discussion

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Starter discussion topics

Measure before optimize?
v-memo when?

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