AMP vs ef.js
Head-to-head usage across the sites we track.
Top sites by authority
AMP · ef.js · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
23
0
Open Page Rank 8+
202
1
Open Page Rank 7+
569
7
Open Page Rank 6+
945
17
Open Page Rank 5+
1,511
23
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
AMP · ef.js · share of sites in each country using one or the other
Indonesia
72,741
20
United States
13,441
38
India
9,842
17
Brazil
8,577
31
Türkiye
6,172
10
United Kingdom
5,698
16
Germany
5,352
13
France
5,143
15
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | AMP | ef.js |
|---|---|---|
| LCP | 2.1 s | 1.5 s |
| INP | 150 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 700 ms | 700 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.