mod_perl vs Shelf
Head-to-head usage across the sites we track.
Top sites by authority
mod_perl · Shelf · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
4
0
Open Page Rank 8+
102
1
Open Page Rank 7+
263
1
Open Page Rank 6+
351
1
Open Page Rank 5+
457
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_perl · Shelf · share of sites in each country using one or the other
United States
1,857
13
India
1,162
5
Japan
1,045
5
Indonesia
1,018
4
United Kingdom
840
170
Germany
828
7
Canada
715
6
France
704
4
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | mod_perl | Shelf |
|---|---|---|
| LCP | 1.5 s | 1.2 s |
| INP | 75 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.