Cowboy vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
Cowboy · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
61
Open Page Rank 8+
15
1,315
Open Page Rank 7+
29
5,213
Open Page Rank 6+
47
9,906
Open Page Rank 5+
58
16,556
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
Cowboy · IIS · share of sites in each country using one or the other
United States
3,626
136,825
India
1,740
68,343
United Kingdom
1,725
49,161
Italy
1,086
46,831
Brazil
2,643
38,951
Canada
1,571
36,284
Germany
1,363
36,200
Türkiye
740
36,724
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | Cowboy | IIS |
|---|---|---|
| LCP | 1.9 s | 1.7 s |
| INP | 75 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.