⚡ Ultra-fast Cloudflare-compatible prefetching — built for SEO, speed, and performance-first websites.
A lightweight, smart prefetching script by Affluent Web Media that intelligently fetches only Cloudflare-cached internal pages — only after user intent is detected. Designed to boost site speed, reduce bandwidth, and improve Core Web Vitals without wasteful preloading.
Optimized for speed-conscious developers, it eliminates wasteful prefetching and validates content before triggering requests — saving bandwidth and improving UX, and reducing load on the origin server. Includes cache-control and CF-Cache-Status filtering. Built for performance-focused websites.
This script ensures that only already-cached internal links are prefetched after lightweight, passive user engagement (e.g., hover or touch). It reduces bandwidth, avoids unnecessary network usage, and improves perceived speed.
Traditional prefetching can waste bandwidth by fetching uncached pages.
This script avoids that — it only prefetches pages that are already cached (HIT) by Cloudflare and not excluded via Cache-Control headers (no-cache, no-store, max-age=0).
-
User Intent-Based Prefetching
- Triggered on:
mouseover(desktop)touchstart(mobile)mousedown(if enabled)viewport(if configured)
- Triggered on:
-
Prefetch Only Cached Content
- Sends a
HEADrequest first - Checks:
CF-Cache-Status: HITCache-ControlandExpiresheaders
- Only then issues a
GETto trigger prefetching - Prevents wasted network activity.
- If already cached in browser or service worker: skips network fetch and no origin load
- Sends a
-
Prefetch Throttling
- First prefetch: 500ms delay
- Second: 1000ms
- Third: 2000ms
- Limits to 3 URLs per session (
pm = 3) • Prevents over-fetching, balances speed and bandwidth
-
De-duplication
- Uses a
Setto track prefetched URLs - No repeat fetches in same session, on reload reset itself
- Uses a
-
Blacklist & Filters
- Avoids specified paths like
/folder1/,/folder2/,/urletc. - Skips:
- Excludes certain URL paths from prefetching
- External domains (unless allowed)
- Same-page
#anchors - Links with
data-noInstant
- Avoids specified paths like
-
Data Attribute Support
<a data-instant>: Force-enable prefetch<a data-noInstant>: Exclude from prefetch<body data-instant-intensity="viewport">: Enable on scroll into view<body data-instant-allow-external-links>: Allow external origins<body data-instant-allow-query-string>: Allow query strings
This is a heavily modified fork of https://instant.page/5.2.0 with the following enhancements:
| Feature | Source |
|---|---|
✅ Uses HEAD first to validate cache status |
Added by us |
✅ Skips GET if CF-Cache-Status not HIT |
Added by us |
✅ Skips uncacheable content (no-cache, no-store, max-age=0) |
Added by us |
✅ Fully avoids <link rel="prefetch"> race conditions |
Modified |
| ✅ Adaptive throttling between prefetches | Modified |
| ✅ More precise blacklist routing | Added by us |
| ✅ Works safely with Cloudflare + JS fetch | Added by us |
<body
data-instant-intensity="viewport"
data-instant-allow-query-string
data-instant-allow-external-links
>
<a href="/about">About Us</a>
<a href="/tools" data-noInstant>Do not prefetch</a>
<script src="predictive-prefetch.min.js" defer></script>
</body>📄 License Original engine: © 2019–2024 Alexandre Dieulot – MIT License instant.page license [https://instant.page/license]
This modified version: © 2025 Affluent Web Media – Licensed under Apache License 2.0
🌐 Credits & SEO Maintained by Affluent Web Media Performance-focused script designed for high-speed websites and technical SEO use cases.
Tested in simplified, GET-based form on: • AstrologyFutureEye.com • AstroLookup.com
🧠 Notes This script does not use to avoid prefetch race conditions or wasted requests.
Cache is validated before fetching full response.
No Service Worker required, but works well with SW-enabled environments.