Most proxy protocols run over TCP; Hysteria2 runs QUIC over UDP. That difference shows clearly on cross-border, high-loss links.

Why it's fast

TCP slows sharply on packet loss. Hysteria2, built on QUIC with an aggressive congestion control (Brutal), is often several times faster than TCP-based protocols on links with 5–20% loss — smoother for streaming and large downloads.

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The trade-off

UDP traffic is easily throttled by ISP QoS, and some networks restrict UDP entirely; its disguise is also less natural than TLS-based protocols. So it works best as a backup link — switch to it when your TCP protocol stalls.

What supports it

Hysteria2 is a standalone project, not a native V2Ray protocol, but it commonly coexists with V2Ray-ecosystem clients. Furious, the NekoRay line, sing-box-based clients and recent v2rayN builds all support it.

Hysteria2 relies on manually entered up/down bandwidth for congestion control. Setting it higher than reality causes loss and actually slows you down — enter conservative values matching the link's real speed.