HHVM vs IIS
Head-to-head usage across the sites we track.
Top sites by authority
HHVM · IIS · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
1
53
Open Page Rank 8+
2
1,275
Open Page Rank 7+
4
5,011
Open Page Rank 6+
4
9,561
Open Page Rank 5+
5
15,981
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
HHVM · IIS · share of sites in each country using one or the other
United States
80
121,069
India
41
60,068
United Kingdom
50
43,214
Italy
41
39,691
Brazil
39
35,276
Germany
54
31,791
Canada
37
31,780
Türkiye
30
31,323
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | HHVM | IIS |
|---|---|---|
| LCP | 1.7 s | 1.6 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 800 ms | 700 ms |
Median site's p75 values from the Chrome UX Report, Aug 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.