What Is WireGuard and Why It's Faster Than Other VPN Protocols

The old guard: OpenVPN and IPSec

For over two decades, OpenVPN and IPSec dominated VPN technology. They work — but they carry enormous legacy weight. OpenVPN was written in 2001 and ships with over 100,000 lines of code. IPSec, while faster, is notoriously difficult to configure correctly. Both protocols negotiate encryption through complex handshakes, require substantial CPU overhead, and were designed before smartphones existed.

The result: sluggish connection times, noticeable battery drain, and configuration mistakes that can silently expose your traffic.

Enter WireGuard

WireGuard was created by Jason Donenfeld in 2015 and merged into the Linux kernel in 2020. Its design philosophy is radical simplicity: the entire protocol is around 4,000 lines of code — compared to OpenVPN's 100,000+. Less code means a smaller attack surface, easier auditing, and far fewer places for bugs to hide.

WireGuard uses only modern, well-vetted cryptographic primitives:

• ChaCha20-Poly1305 for symmetric encryption (or AES-256-GCM on hardware-accelerated devices)
• Curve25519 for key exchange (Diffie-Hellman)
• BLAKE2s for hashing
• SipHash24 for hashtable keys
• HKDF for key derivation

All of these are chosen because they are fast in software (important for mobile CPUs), well-audited, and resist known attacks.

Why WireGuard is faster

Three reasons:

1. Minimal handshake. WireGuard's cryptographic handshake completes in a single round-trip. OpenVPN requires multiple negotiation steps. This means VeilTun connects in under a second — OpenVPN typically takes 5-10 seconds.

2. Runs in kernel space. On Linux (our server infrastructure), WireGuard is implemented as a kernel module. Network packets are processed without switching between kernel and user space — a significant overhead reduction compared to OpenVPN's user-space implementation.

3. Stateless design. WireGuard peers are identified only by their public key. There is no session state to maintain beyond cryptographic keys, which means roaming between networks (Wi-Fi → cellular) happens instantly with no reconnection required.

Benchmark comparisons consistently show WireGuard achieving 60-90% of raw network throughput, while OpenVPN caps around 30-50% on the same hardware.

WireGuard and privacy

WireGuard's architecture has a nuance worth understanding: by design, it maintains a last-handshake timestamp for each peer. This is stored in kernel memory — not on disk. When the server is rebooted or the peer is removed, this timestamp disappears.

VeilTun handles this correctly: we remove WireGuard peer entries when subscriptions expire or accounts are deleted. There is no persistent connection log.

Is WireGuard actually secure?

Yes. The code has been independently audited multiple times, including by the Trail of Bits security firm. The cryptography is conservative and well-understood. The small codebase makes formal verification tractable — something impossible with OpenVPN.

WireGuard also has perfect forward secrecy: even if a private key is somehow compromised in the future, past session traffic remains encrypted and undecryptable.

The bottom line

WireGuard is not marketing hype. It is a genuine engineering advancement: faster, simpler, and more auditable than everything that came before. For a privacy-focused VPN like VeilTun, it is the only sensible choice.

If you want to go deeper, the original WireGuard whitepaper is technically rigorous and worth reading.