H2O vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
H2O · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
50
Open Page Rank 8+
0
1,251
Open Page Rank 7+
0
4,874
Open Page Rank 6+
2
9,276
Open Page Rank 5+
3
15,469
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
H2O · IIS · share of sites in each country using one or the other
United States
5
117,730
India
5
58,829
United Kingdom
3
42,820
Italy
2
40,808
Brazil
2
34,656
Canada
2
31,601
Türkiye
3
31,246
Germany
9
31,200
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | H2O | IIS |
|---|---|---|
| LCP | 1.6 s | 1.7 s |
| INP | 50 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 600 ms | 700 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.