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
225
Open Page Rank 8+
1
3,854
Open Page Rank 7+
7
15,804
Open Page Rank 6+
17
30,256
Open Page Rank 5+
23
51,401
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
38
596,374
India
17
237,671
United Kingdom
16
191,623
Germany
13
162,924
Brazil
31
161,653
Canada
12
147,238
France
15
140,452
Australia
12
101,917
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | ef.js | React |
|---|---|---|
| LCP | 1.5 s | 1.9 s |
| INP | 100 ms | 75 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.
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 |