Cloudflare Rocket Loader vs Intersection Observer
Head-to-head usage across the sites we track.
Top sites by authority
Cloudflare Rocket Loader · Intersection Observer · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cloudflare Rocket Loader · Intersection Observer · share of sites in each country using one or the other
United States
29,959
491
India
19,958
491
Saudi Arabia
15,432
90
United Kingdom
14,634
302
Brazil
13,122
159
Germany
11,955
278
Canada
11,512
218
Indonesia
11,371
254
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cloudflare Rocket Loader | Intersection Observer |
|---|---|---|
| LCP | 2.1 s | 1.8 s |
| INP | 100 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 1000 ms | 800 ms |
Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.
All Cloudflare Rocket Loader sites · All Intersection Observer sites