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
3,802
Open Page Rank 7+
6
15,708
Open Page Rank 6+
17
30,122
Open Page Rank 5+
23
51,158
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
651,665
India
20
252,538
United Kingdom
18
210,954
Germany
17
176,161
Brazil
34
168,763
Canada
11
164,079
France
17
159,876
Australia
16
111,932
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | ef.js | React |
|---|---|---|
| LCP | 1.4 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, 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.
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 |
|---|---|
| marsus.com | Apr 2026 |