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
30,747
490
India
20,411
493
United Kingdom
15,016
318
Saudi Arabia
14,825
93
Brazil
13,494
167
Germany
12,434
272
Indonesia
11,700
256
Canada
11,691
213
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cloudflare Rocket Loader | Intersection Observer |
|---|---|---|
| LCP | 2.2 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, Aug 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