h5ai vs HTTP/3
Head-to-head usage across the sites we track.
Top sites by authority
h5ai · HTTP/3 · how many of each technology's sites sit in the web's highest authority tiers
Open Page Rank 9+
0
217
Open Page Rank 8+
3
3,633
Open Page Rank 7+
3
17,286
Open Page Rank 6+
5
37,596
Open Page Rank 5+
5
73,412
Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.
By country
h5ai · HTTP/3 · share of sites in each country using one or the other
United States
39
1,284,004
India
20
592,975
United Kingdom
25
436,501
Brazil
25
418,679
Indonesia
26
328,375
Canada
15
321,328
Germany
24
316,957
Italy
22
305,727
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | h5ai | HTTP/3 |
|---|---|---|
| LCP | 2 s | 1.9 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 750 ms | 800 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.