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+
24
0
Open Page Rank 8+
199
1
Open Page Rank 7+
553
8
Open Page Rank 6+
917
17
Open Page Rank 5+
1,458
24
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
70,740
18
United States
13,389
39
India
9,882
20
Brazil
8,300
31
Türkiye
5,993
11
United Kingdom
5,796
15
Germany
5,405
14
France
5,120
16
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | AMP | ef.js |
|---|---|---|
| LCP | 2.1 s | 1.6 s |
| INP | 150 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 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.