Vue 3.6 ships with one of the most ambitious features the Vue team has ever built: Vapor Mode . It's a completely new rendering strategy that ditches the Virtual DOM entirely — and the performance numbers are wild. Let's break it all down. 🤔 First, Why Does the Virtual DOM Exist? Before we can appreciate Vapor Mode, we need to understand the problem it solves. Every modern JavaScript framework faces the same challenge: when your state changes, how do you efficiently update the browser's DOM? The answer most frameworks landed on is the Virtual DOM (VDOM) : Represent your UI as a lightweight JavaScript object tree (VNodes) When state changes, create a new virtual tree Diff the old tree vs the new tree Apply only the changed parts to the real DOM This is the model Vue has used since Vue 2. Vue 3 already made it smarter with tricks like static hoisting and patch flags — but it still creates and diffs VNode trees at runtime on every update.…