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Vue Academy · Lesson

Vue Vapor Mode: Compile-Time Optimization

Vapor mode removes the virtual DOM, what it means for performance, opt-in compilation.

What Is Vapor Mode

Vapor Mode is an alternative compilation strategy for Vue that removes the virtual DOM entirely. Instead of diffing VNode trees, the compiler emits code that updates real DOM nodes directly. It is opt-in and aims for large performance and memory gains.

How the Virtual DOM Works Today

Normally, a render function returns a tree of VNodes. On each update Vue creates a new tree and diffs it against the old one to find changes. This diffing has runtime cost and allocates objects every render.

// conceptually, each render produces VNodes
function render() {
  return h('div', null, [
    h('span', null, count.value)
  ])
}
// Vue diffs new VNodes vs old to patch the DOM

All lessons in this course

  1. Vue Vapor Mode: Compile-Time Optimization
  2. Vite Ecosystem: Plugins and Tooling
  3. Vue Macros and Community Proposals
  4. Choosing the Right Vue Stack for 2025+
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