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+
20
0
Open Page Rank 8+
187
1
Open Page Rank 7+
535
6
Open Page Rank 6+
915
17
Open Page Rank 5+
1,485
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
73,082
35
United States
15,093
39
India
10,920
20
Brazil
9,291
34
Singapore
7,484
7
Türkiye
7,002
13
United Kingdom
6,420
18
Germany
6,209
17
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | AMP | ef.js |
|---|---|---|
| LCP | 2.1 s | 1.4 s |
| INP | 150 ms | 100 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 ms |
Median site's p75 values from the Chrome UX Report, Jun 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.