VLESS Reality vs WireGuard

VLESS Reality (specifically with the Vision flow, xtls-rprx-vision) and WireGuard are the two protocols Fexyn primarily ships. They serve different network environments. The honest comparison.

At a glance

	WireGuard	VLESS Reality + Vision
Speed	Faster	Slower
Overhead	~5-10%	~10-15%
Transport	UDP	TCP (real TLS 1.3)
Detection in DPI markets	Blocked instantly	Survives
Connection time	Sub-second	~100ms additional handshake
Codebase	Small (~4,000 lines)	Larger (XRay-core)
Audit history	Multiple	Multiple research papers + USENIX 2024
Default in Fexyn	Yes (Bolt)	Stealth, fallback

The detection question

This is the dividing line. In countries with active VPN-protocol DPI (Russia's TSPU, China's Great Firewall, Iran's Filtering Resistance Agency, Pakistan's PTA crackdown, UAE's TRA, Saudi's CITC), WireGuard is detected on the first packet by handshake fingerprint and blocked. The connection never establishes.

VLESS Reality with the Vision flow performs a real TLS 1.3 handshake to a real public site (microsoft.com, cloudflare.com). The traffic on the wire is statistically indistinguishable from normal HTTPS browsing to the camouflage host. DPI cannot fingerprint it without breaking traffic to the camouflage host itself, which would also break the rest of the network.

Result: WireGuard works on clean networks; Reality works on DPI-heavy networks. There is no overlap question — the answer for each is determined by the network you are on.

Speed comparison

WireGuard wins on clean networks. Reality's TCP transport, TLS 1.3 handshake to camouflage host, and additional framing add overhead that WireGuard does not have. Our own benchmarks on a 1Gbps source connection routed to Frankfurt show WireGuard at ~890 Mbps and Reality at ~825 Mbps — about 7% slower.

The handshake difference is more noticeable than the throughput difference. WireGuard establishes in sub-second; Reality needs about 100ms additional time for the TLS 1.3 handshake to the camouflage host. For most use cases this is invisible; for users who care about connection time specifically, WireGuard wins.

When to use which

WireGuard (Fexyn Bolt): clean networks. Home Wi-Fi in most countries. Office networks that do not actively block VPN. Coffee shops. Hotels in countries without DPI mandate.

VLESS Reality (Fexyn Stealth): DPI-heavy markets. Russia, China, Iran, Pakistan, UAE, Saudi Arabia, Turkey, parts of Egypt. Anywhere where standard VPN protocols are detected and blocked.

The Fexyn client tries Bolt first by default. If Bolt fails to handshake (almost always because of network filtering), the client switches to Stealth automatically. Users in known-DPI markets can pin Stealth as the default to skip the failed-Bolt-attempt step.

The Reality + Vision distinction

Plain VLESS without Reality is increasingly detected (Russia's TSPU started catching it in late 2025). Plain Reality without the Vision flow is also increasingly detected. The combination — Reality with xtls-rprx-vision — is what currently survives.

This matters because some smaller VPN providers ship Reality without Vision. Those deployments have started failing in Russia. Fexyn ships Reality+Vision specifically.

The protocol guide covers the Vision flow in technical detail.

Why WireGuard cannot be made invisible

The structural problem: WireGuard's handshake initiation is a fixed 148-byte UDP packet with specific structure. The structure cannot be obscured without breaking the protocol; obfuscation wrappers around WireGuard (NordVPN's NordLynx, Surfshark's Camouflage, ExpressVPN's Lightway) wrap the WireGuard handshake in TLS-style framing but do not eliminate the underlying fingerprint.

DPI in DPI-heavy markets has been catching these obfuscation wrappers since 2023. The pattern continues; the wrappers play catch-up; the wrappers eventually fail.

VLESS Reality's structural difference: there is no fake handshake to obscure. The handshake is a real TLS 1.3 handshake to a real public site. The "deception" is a small piece of cryptographic material hidden inside the otherwise-genuine handshake. There is nothing for DPI to fingerprint because the parts that are visible to DPI are genuinely from a real public site.

What Fexyn ships

Both. Bolt (WireGuard) is the default; Stealth (Reality + Vision) is the fallback for DPI-heavy networks. The client switches automatically when Bolt fails to handshake. Users in known-DPI markets pin Stealth as the default.

Try Fexyn free for 7 days — both protocols on every plan.