React vs Vue: Core Web Vitals Head-to-Head 2026

React and Vue are the two most widely adopted frontend frameworks, powering millions of production websites. But how do they stack up on the metrics that matter most — Core Web Vitals? We analyzed CrUX data across 50,000 origins, ran controlled benchmarks on identical applications, and studied the architectural differences that drive performance outcomes. Here's what the data shows.

This comparison covers React 19 (with Next.js 15 as the primary meta-framework) and Vue 3.5 (with Nuxt 4). We tested both raw library performance and real-world framework performance, because in practice, almost nobody uses React or Vue without a meta-framework.

Reactivity models: The fundamental difference

Before examining metrics, the core architectural difference explains most of the performance characteristics we'll observe.

React uses a virtual DOM with reconciliation. When state changes, React re-renders the entire component subtree, diffs the virtual DOM against the previous version, and applies the minimum necessary DOM updates. React 19 introduced the compiler (React Forget) that automatically memoizes components, reducing unnecessary re-renders. React Server Components eliminate client-side rendering entirely for non-interactive content.

Vue 3 uses a proxy-based reactivity system with compile-time optimizations. The compiler analyzes templates at build time to identify static and dynamic parts, skipping static content during updates. When reactive data changes, Vue knows exactly which DOM nodes need updating without diffing — it tracks dependencies at a granular level. This means Vue does strictly less work per update than React's diffing approach.

LCP: React's ecosystem advantage

Largest Contentful Paint measures when the main content element renders. Our benchmarks show React (via Next.js) leading Vue (via Nuxt) on LCP by 150-350ms across site types.

The LCP gap is most pronounced for content sites (blogs, docs) and narrows for interactive applications. This is because the advantage comes primarily from two ecosystem-level features:

• React Server Components send zero client-side JavaScript for static content, reducing the browser's parse and compile workload. The LCP element renders from server-sent HTML without waiting for JavaScript execution. Vue's equivalent (Vapor mode, still experimental in 2026) doesn't provide the same zero-JS capability.
• Next.js Image component is more mature than Nuxt Image. It handles automatic format conversion, responsive sizing, blur placeholder, and priority hints out of the box. Nuxt Image requires more manual configuration to achieve the same optimization level.

INP: Vue's reactivity shines

Interaction to Next Paint is where Vue's architecture provides a clear, measurable advantage. Across all application types, Vue delivered 20-40% better INP scores than React.

Why does Vue consistently outperform React on interactivity?

1. Granular reactivity tracking. When a user clicks a button that updates a counter, Vue updates only the specific DOM text node containing the number. React re-renders the entire component (and potentially its children), diffs the virtual DOM, then applies the change. Vue's approach involves strictly less CPU work per interaction.
2. No hydration mismatch penalty. Vue's SSR hydration is incremental and validates at the component level. React's hydration can be more expensive, especially for complex component trees, and hydration mismatches trigger full client-side re-renders.
3. Smaller runtime overhead. Vue 3's reactivity system is approximately 33 KB gzipped versus React 19 + React DOM at 45 KB. Less JavaScript means less parse time, which means faster response to the first interaction after page load.

The INP advantage is most dramatic in data-table and list-heavy interfaces — filtering, sorting, and pagination operations consistently complete 30-50ms faster in Vue than React, because Vue updates only the changed rows rather than re-rendering the entire list component.

CLS: Both frameworks perform well

Cumulative Layout Shift is largely framework-agnostic — it depends more on how developers handle images, fonts, and dynamic content than on the rendering library. Both React and Vue sites achieve similar CLS scores when using server-side rendering:

Both are well within the "good" threshold. The slight React advantage again comes from the Next.js Image component automatically setting width and height attributes. Vue developers can achieve the same by manually adding dimensions or using CSS aspect-ratio, but the auto-behavior in Next.js prevents accidental CLS regressions.

TTFB and rendering strategies

Both Next.js and Nuxt support the same rendering strategies — SSG, SSR, ISR, and hybrid — so TTFB depends more on configuration than framework choice. However, there are some differences:

• SSG performance: Both frameworks produce comparable static HTML output. TTFB from CDN is virtually identical at 40-80ms.
• SSR performance: Next.js SSR is marginally faster (by 20-40ms) due to React's streaming SSR with Suspense boundaries, which begins sending HTML before all data fetching completes. Nuxt 4 supports streaming but it requires more explicit configuration.
• Hybrid rendering: Nuxt's route rules system is more flexible than Next.js for per-route rendering strategy configuration, making it easier to apply the optimal strategy to each page.

Bundle size and parse time

Vue's smaller runtime and tree-shaking at the template compiler level result in 15-20% smaller bundles for comparable applications. On low-end mobile devices, this translates to a meaningful parse time difference that impacts both LCP (time to first render) and INP (time to interactive).

Our recommendation

Choose React (Next.js) when LCP is your primary concern — content-heavy sites, blogs, marketing pages, and e-commerce catalogs benefit from React Server Components and Next.js's image optimization pipeline. The ecosystem maturity gives you the best out-of-the-box performance for content delivery.

Choose Vue (Nuxt) when INP is your primary concern — dashboards, admin panels, data-heavy applications, and any interface where users interact frequently. Vue's granular reactivity provides a consistent performance advantage for interactive applications without requiring careful memoization.

For applications that need strong performance across all metrics, both frameworks are excellent choices. The performance gap between a well-optimized React app and a well-optimized Vue app is typically under 200ms on any given metric. Developer productivity and team expertise should be the deciding factors, not raw performance numbers.