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mediago-dev--mediago/.agents/skills/vercel-react-best-practices/rules/bundle-defer-third-party.md
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2026-07-13 13:39:47 +08:00

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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>
  );
}