HTTP/3 is faster on poor connections. HTTP/2 is widely supported. HTTP/3 is the future but not universal yet.
Factor
HTTP/2
HTTP/3
Speed (Good WiFi)
⭐⭐⭐⭐⭐ Fast
⭐⭐⭐⭐⭐ Similar
Speed (Poor WiFi)
⭐⭐⭐ OK
⭐⭐⭐⭐⭐ Much faster
Support
✅ 97% browsers
⚠️ 75% browsers
HTTP/2
Current web protocol using TCP.
✓ Pros
Universal support
Works everywhere
Faster than HTTP/1.1
Multiplexing
✗ Cons
Slower on bad connections
Head-of-line blocking
TCP limitations
HTTP/3
Next-gen web protocol using QUIC (UDP).
✓ Pros
Faster on poor connections
No head-of-line blocking
0-RTT connection
Better mobile performance
✗ Cons
Not universally supported
Firewall issues
Newer (less tested)
The Verdict
HTTP/3 is better but not universally supported yet. Your browser automatically uses the best available. Google, Facebook, Cloudflare already use HTTP/3.
Frequently Asked Questions
How do I enable HTTP/3?
It's automatic. Chrome, Firefox, Safari support it. The website must support it too - you can't force it client-side.