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
208
Open Page Rank 8+
0
3,591
Open Page Rank 7+
0
17,002
Open Page Rank 6+
2
36,960
Open Page Rank 5+
2
72,129
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
36
1,141,651
India
24
531,962
Brazil
27
414,021
United Kingdom
28
386,042
Indonesia
25
294,061
Germany
20
289,537
Canada
22
280,974
Italy
15
273,070
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 | 900 ms | 800 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.