ef.js vs React
Head-to-head usage across the sites we track.
Top sites by authority
ef.js · React · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
223
Open Page Rank 8+
1
3,861
Open Page Rank 7+
8
15,766
Open Page Rank 6+
17
30,165
Open Page Rank 5+
24
51,195
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
ef.js · React · share of sites in each country using one or the other
United States
39
595,277
India
20
243,719
United Kingdom
15
194,085
Brazil
31
164,323
Germany
14
162,915
Canada
11
148,255
France
16
143,971
Spain
34
106,955
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | ef.js | React |
|---|---|---|
| LCP | 1.6 s | 1.9 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.
Sites that switched
Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.
ef.js to React
| Domain | When |
|---|---|
| agendaeletronica.com.br | Jul 2026 |
| marsus.com | Apr 2026 |