How do developers enable and use Vapor Mode in Vue 3.4+ projects?

Vapor Mode in Vue 3.4+ activates via .vapor file postfix or vue/vapor imports, compiling templates to fine-grained DOM signals for 2-3x faster renders without virtual DOM overhead.

​Developers enable it per-component by renaming files (e.g., MyComponent.vapor.vue) or importing from vue/vapor in <script setup>, mixing seamlessly with standard components.​

Vite auto-detects Vapor files during build, generating optimized render functions that reduce memory by 60% in list-heavy UIs.​​

Beta access requires Vue 3.6+ alphas via npm install vue@next, ideal for performance-critical apps like dashboards.