Engintron vs Shelf
Head-to-head usage across the sites we track.
Top sites by authority
Engintron · Shelf · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 8+
10
1
Open Page Rank 7+
29
1
Open Page Rank 6+
47
1
Open Page Rank 5+
73
1
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Engintron · Shelf · share of sites in each country using one or the other
Bosnia & Herzegovina
1,608
0
Croatia
1,546
2
India
1,453
6
Israel
1,265
1
United States
1,028
12
Uzbekistan
849
3
Brazil
803
7
Serbia
672
2
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Engintron | Shelf |
|---|---|---|
| LCP | 2.3 s | 1.2 s |
| INP | 75 ms | 50 ms |
| CLS | 0 | 0 |
| TTFB | 1300 ms | 300 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.