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Vue Vapor Mode is an opt-in way to compile eligible Vue Single-File Components (SFCs) with the goal of reducing baseline bundle size and improving performance. It is not the same as writing a browser game with no framework: Vapor remains a Vue compilation mode, supports only a subset of Vue APIs, and excludes components that depend on VNodes or the component public instance proxy. For developers who have built games with plain browser APIs, that distinction is the important one: Vapor changes how eligible Vue components are compiled, not the fact that the application is using Vue.
What Vapor Mode changes—and what it does not
Vue’s 3.6 release candidate notes describe Vapor Mode as a compilation mode for Vue SFCs intended to reduce baseline bundle size and improve performance. The feature is opt-in, and the notes recommend trying it in performance-sensitive parts of existing apps or in small new apps. Those are stated goals and guidance, not a guarantee that every project will ship less code or run faster.
It helps to distinguish three approaches:
- No framework: application code uses browser APIs directly, without Vue’s component system.
- Regular Vue: components use Vue’s standard runtime and its VNode-oriented rendering model.
- Vue Vapor Mode: eligible Vue SFCs are compiled in a mode that avoids VNode-dependent features in Vapor components, within the API subset the release supports.
Vapor therefore should not be described as removing all runtime code or as interchangeable with raw JavaScript. The release notes establish neither claim.
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A browser game built without a framework can make the cost of abstractions visible: you choose how to represent state, update the screen, and organize input and rendering. But the available Vue documentation does not compare Vapor with a framework-free game, and there are no game-specific implementation details or measurements here. So no honest conclusion can be drawn about which approach is faster, smaller, or simpler for a particular game.
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Instead, the useful lesson is about the question to ask. If a game’s bottleneck is bundle size or the cost of updating the interface, compare implementations on the same workload. Measure compressed bundle size, startup and interaction responsiveness, the update workload, implementation complexity, and whether the code needs Vue APIs or rendering patterns Vapor does not support. Without those matched measurements, “framework-free” and “Vapor” are different design choices, not performance results.
Which Vue components can use Vapor Mode?
The 3.6 RC notes say Vapor supports template-only SFCs and SFCs using <script setup>. The Options API is not supported. Components that rely on VNodes or the component public instance proxy are also unavailable as Vapor components. Check these constraints against a component’s actual dependencies before considering it a candidate.
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- Potential candidates: template-only SFCs and SFCs using
<script setup>, provided they stay within the supported API subset. - Not supported as described in the RC notes: Options API components and components that depend on VNodes or the public instance proxy.
The notes say the intended Vapor feature set is complete for the release-candidate phase. That does not mean the feature is generally stable or that Vue 3.6 has shipped as a stable release.
Do not confuse Vapor with Vue’s existing bundle-size optimizations
Vue’s published size figures describe different builds and contexts; none is a Vapor Mode measurement. The Performance guide says that precompiling templates means the compiler need not be shipped to the browser, saving about 14 KB minified and gzipped and avoiding runtime compilation cost. The Tooling guide separately estimates about 14 KB of extra payload for a full build that includes the compiler compared with a runtime-only build. These figures concern the compiler/build setup, not a Vapor-specific reduction.
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| Vue documentation figure | What it describes | What it does not establish |
|---|---|---|
| About 16 KB, minified and Brotli-compressed | Approximate size of a minimal Vue app using essential APIs, according to the FAQ. | Vapor’s bundle size or savings. |
| About 27 KB | Approximate runtime size if an app uses every optional Vue feature, according to the FAQ. | A size guaranteed for every regular Vue app or a Vapor comparison. |
| About 41 KB | Approximate size when Vue is used without a build tool and the template compiler must be shipped, according to the FAQ. | The size of a production build using precompiled templates or Vapor. |
These are approximate documentation figures, published without a year in the retrieved pages. Their differing assumptions matter: they cannot be lined up as before-and-after results for one application.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to check before adopting it
- Confirm the release status. The Vue core release listing shows Vue 3.6.0-rc.10 dated September 30, 2026. Treat Vapor as a release-candidate feature based on these sources, not as generally stable.
- Audit candidate components. Look for Options API usage, VNode dependencies, and use of the public instance proxy; also confirm the component fits the supported SFC forms and API subset.
- Define the actual performance problem. Decide whether you need to reduce shipped JavaScript, improve startup, or make a particular update workload more responsive. Bundle size alone does not measure interaction performance.
- Compare the same workload. If evaluating Vapor against regular Vue or plain browser code, use the same game behavior and report bundle compression, startup and interaction responsiveness, update conditions, and implementation complexity. Do not infer results from Vue’s general bundle figures.
Vue’s documentation also describes using Vue through a standalone script, which is a separate way to adopt Vue rather than a framework-free implementation. Its guide notes that petite-vue is in maintenance mode; that is useful context if considering lightweight Vue-like approaches, but it is not evidence about Vapor’s performance.
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