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Micro Frontends Architecture with Module Federation · Lesson

Prefetching and Preloading Micro Frontends

Learn how to anticipate user navigation and fetch micro frontend bundles ahead of time to make transitions feel instant.

Prefetching and Preloading Micro Frontends is a free Micro Frontends Architecture with Module Federation lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Micro Frontends Architecture with Module Federation learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

From Lazy to Eager-ish

Lazy loading saves the initial load but adds a wait when the user first visits an MFE. Prefetching closes that gap by fetching likely-needed bundles in advance.

Prefetch vs Preload

The browser offers two hints:

  • preload: fetch now, high priority, needed soon
  • prefetch: fetch when idle, low priority, maybe needed later

Resource Hint Tags

You can hint the browser directly with link tags, letting it fetch an MFE bundle during idle time.

<link rel="prefetch" href="/products/remoteEntry.js">
<link rel="preload" href="/cart/remoteEntry.js" as="script">

Prefetching on Intent

A powerful trick: start fetching an MFE when the user hovers a link, well before they click. The bundle is often ready by the time the click lands.

link.addEventListener("mouseenter", () => {
  import("products/App");
});

Programmatic Prefetch with import()

Because Module Federation uses dynamic import(), calling it early (without using the result) warms the cache for later.

function prefetchProducts() {
  import("products/App"); // result ignored
}

Prefetch After First Paint

Fetch the most likely next MFE once the initial page is interactive, using idle time so it never competes with critical content.

requestIdleCallback(() => {
  import("cart/App");
});

Predicting What to Prefetch

Use analytics to learn common navigation paths. If most users go from home to products, prefetch the products MFE right after the home page loads.

Avoiding Over-Prefetching

Prefetching everything wastes bandwidth and battery, especially on mobile. Prefetch only high-probability destinations, and respect data-saver settings.

if (!navigator.connection?.saveData) {
  import("products/App");
}

Preloading Shared Dependencies

Preloading shared libraries (like React) used by upcoming MFEs further smooths transitions, since the shared chunk is already cached when the MFE mounts.

Measuring the Impact

Track the time from navigation intent to MFE-rendered. Effective prefetching should noticeably shrink this metric in real-user monitoring.

A Balanced Strategy

Combine techniques: preload the next MFE on hover, prefetch the single most likely route on idle, and skip prefetch on constrained networks.

Quick Check

Test your prefetching knowledge.

Recap

You learned to prefetch micro frontends:

  • Prefetch fills the wait that lazy loading leaves
  • Use preload (soon) vs prefetch (maybe later)
  • Fetch on hover/intent and during idle time
  • Predict routes from analytics
  • Avoid over-prefetching on slow networks

Smart prefetching makes MFE navigation feel instant.

Frequently asked questions

Is the “Prefetching and Preloading Micro Frontends” lesson free?

Yes — the full text of “Prefetching and Preloading Micro Frontends” is free to read here on the web, and the Micro Frontends Architecture with Module Federation course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Micro Frontends Architecture with Module Federation course, upgrade to CoddyKit PRO.

What will I learn in “Prefetching and Preloading Micro Frontends”?

Learn how to anticipate user navigation and fetch micro frontend bundles ahead of time to make transitions feel instant. You practise Micro Frontends Architecture with Module Federation with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Micro Frontends Architecture with Module Federation?

No prior experience is required. Micro Frontends Architecture with Module Federation on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Prefetching and Preloading Micro Frontends” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Micro Frontends Architecture with Module Federation lesson?

Yes. Every Micro Frontends Architecture with Module Federation lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Lazy Loading Micro Frontends
  2. Bundle Size Reduction Techniques
  3. Caching Strategies
  4. Prefetching and Preloading Micro Frontends
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