video/.agents/skills/vercel-react-best-practices/rules/bundle-defer-third-party.md

title, impact, impactDescription, tags

title	impact	impactDescription	tags
Defer Non-Critical Third-Party Libraries	MEDIUM	loads after hydration	bundle, third-party, analytics, defer

Defer Non-Critical Third-Party Libraries

Analytics, logging, and error tracking don't block user interaction. Load them after hydration.

Incorrect (blocks initial bundle):

import { Analytics } from '@vercel/analytics/react'

export default function RootLayout({ children }) {
  return (
    <html>
      <body>
        {children}
        <Analytics />
      </body>
    </html>
  )
}

Correct (loads after hydration):

import dynamic from 'next/dynamic'

const Analytics = dynamic(
  () => import('@vercel/analytics/react').then(m => m.Analytics),
  { ssr: false }
)

export default function RootLayout({ children }) {
  return (
    <html>
      <body>
        {children}
        <Analytics />
      </body>
    </html>
  )
}