IIS vs Zend
Head-to-head usage across the sites we track.
Top sites by authority
IIS · Zend · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
50
1
Open Page Rank 8+
1,251
3
Open Page Rank 7+
4,874
8
Open Page Rank 6+
9,276
12
Open Page Rank 5+
15,469
18
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
IIS · Zend · share of sites in each country using one or the other
United States
117,730
123
India
58,829
63
United Kingdom
42,820
58
Italy
40,808
61
Brazil
34,656
65
Canada
31,601
44
Türkiye
31,246
32
Germany
31,200
56
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | IIS | Zend |
|---|---|---|
| LCP | 1.7 s | 1.5 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 700 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.