Performance
HTTP/3
QUIC-over-UDP transport. Faster handshakes and resilience to packet loss on flaky networks. Increasingly standard at the CDN layer.
What it is
HTTP semantics over QUIC, which is built on UDP rather than TCP. Eliminates head-of-line blocking, recovers faster from packet loss, and combines TLS handshake into transport setup.
Why it matters
Real-world wins on mobile, lossy networks, and high-latency users. Cloudflare, Fastly, and CloudFront support it with a single toggle.
Who it applies to
Sites with mobile-heavy or international audiences.
How WQI scores it
Web Quality Index considers this standard satisfied when the supporting factor passes.
| # | Factor | Status |
|---|---|---|
| 30 | HTTP/3 support | planned |
0 of 1 supporting factors are currently collected. Sites where the remaining 1 haven't been measured will show as partial or unknown on this standard until the data lands.