4K streaming over VPN
Stream UHD without buffering. Our throughput tests show <5% playback impact on a 100 Mbps Netflix stream.
//03Speed
Two protocols, zero compromises.
WireGuard for clean networks, VLESS + XTLS-Vision when DPI is in the way. Both push near-line-rate with zero-copy splice on the data path.
//01Why this matters
Most VPNs cap your bandwidth — by accident.
Traditional VPNs lose 30-60% of your throughput to user-space packet copying, TCP-over-TCP retransmission, or both. SecureFox picks the protocol that fits your network: WireGuard when there's nothing in the way (fastest, kernel-accelerated where supported), and VLESS + XTLS-Vision with zero-copy splice when DPI is in play (almost no CPU overhead, even at gigabit). You don't choose — the engine picks based on a 200ms reachability probe at connect time.
//02How it works
Zero-copy data path, regardless of protocol.
Both protocol stacks avoid the user-space packet copy that strangles older VPNs. WireGuard uses Linux's native crypto routing — your packets never leave the kernel until they go out the network card. VLESS + XTLS-Vision uses splice() to move bytes between sockets without ever copying them into user memory. The result: saturate your gigabit fibre, your 5G tether, or your office Wi-Fi without the usual VPN throttle.
DefaultWireGuard (UDP, kernel-fast)
FallbackVLESS + XTLS-Vision (TCP/443, splice)
Selection200ms probe at connect
Overhead<3% throughput loss vs raw connection
//03Use cases
Speed matters everywhere.
Large file transfers
Cloud backups, git pushes of giant assets, video uploads — full bandwidth available.
Cloud gaming
Sub-30ms added latency on nearby nodes — playable on services like GeForce Now, Xbox Cloud.
Video calls
Stable jitter and low packet loss matter more than raw speed — both protocols deliver.
//04What you get
Speed you can actually feel.
- Near-line-rate throughput on both protocols
- Auto-switch between WireGuard and VLESS based on network conditions
- Kernel-accelerated WireGuard on supported platforms
- Zero-copy splice() data path on VLESS — minimal CPU impact
- Server-side traffic shaping disabled — your bandwidth is your bandwidth
//05Speed FAQ
Common questions about VPN performance.
How much speed loss should I expect?+
On WireGuard with a nearby healthy server, <5% from raw line speed. On VLESS, <10%. Both are well below the 30-60% typical of older VPN protocols.
Why are you slower than my no-VPN baseline?+
Any VPN routes through an intermediate server, which adds latency and a hop. The encryption overhead itself is negligible (<3%); the rest comes from physical routing distance.
Can I force WireGuard or VLESS?+
Yes, in Settings → Advanced. By default we let the engine pick; manual override is useful for testing or when one is misbehaving.
Does the protocol affect security?+
Both protocols give you AES-256-GCM payload encryption. WireGuard's handshake is faster but more recognisable. VLESS + REALITY hides the handshake itself. Pick speed when you can, stealth when you must.
//06Features
Related features
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