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
3,600
Open Page Rank 7+
0
17,128
Open Page Rank 6+
1
37,410
Open Page Rank 5+
2
72,694
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
1,137,483
India
24
533,896
Brazil
24
409,200
United Kingdom
24
387,999
Indonesia
24
291,484
Germany
20
286,932
Italy
19
284,574
Canada
21
281,458
Audience countries from the Chrome UX Report, top markets of either technology.
Real user performance
| Metric | h5ai | HTTP/3 |
|---|---|---|
| LCP | 1.8 s | 1.9 s |
| INP | 75 ms | 75 ms |
| CLS | 0 | 0 |
| TTFB | 750 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.