mod_ssl vs Shelf
Head-to-head usage across the sites we track.
Top sites by authority
mod_ssl · Shelf · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
0
Open Page Rank 8+
37
1
Open Page Rank 7+
115
1
Open Page Rank 6+
182
1
Open Page Rank 5+
254
1
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
mod_ssl · Shelf · share of sites in each country using one or the other
Japan
2,538
5
United States
2,061
13
South Korea
1,782
6
United Kingdom
912
170
Germany
1,065
7
India
1,063
5
France
986
4
Spain
899
3
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | mod_ssl | Shelf |
|---|---|---|
| LCP | 1.5 s | 1.2 s |
| INP | 50 ms | 50 ms |
| CLS | 0 | 0 |
| TTFB | 600 ms | 300 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.