We run all three protocols side by side on every exit node in our fleet, so this comparison comes from operating them in production — not from repeating other blogs.
The short version
| WireGuard | OpenVPN | IKEv2/IPSec | |
|---|---|---|---|
| Speed (same box, same line) | Fastest | 30–60% slower | Close to WireGuard |
| Reconnect after network switch | Fast (~1 RTT) | Slow (full TLS handshake) | Instant (MOBIKE) |
| Battery on mobile | Very good | Poor if always-on | Excellent (native on iOS) |
| Gets through hostile firewalls | UDP only — often blocked | TCP 443 — nearly always works | UDP 500/4500 — often blocked |
| Code size / audit surface | ~4,000 lines | ~100,000+ lines | OS-native implementations |
| Cipher | ChaCha20-Poly1305 | AES-256-GCM (typ.) | AES-256 (typ.) |
When is WireGuard the right choice?
Almost always, when the network lets you. A single-round-trip handshake, kernel-level implementation, and ChaCha20 — which is much faster than AES on CPUs without AES-NI hardware — make it the throughput king. On our nodes a gigabit line saturates on WireGuard with CPU to spare, while OpenVPN needs multiple cores to get close.
WireGuard's weakness is that it is UDP-only by design. Networks that block or throttle unknown UDP — hotels, airports, corporate guest Wi-Fi, several countries — kill it completely. There is no TCP fallback in the protocol itself.
When does OpenVPN still win in 2026?
When the network is hostile. OpenVPN over TCP on port 443 is byte-for-byte hard to distinguish from ordinary HTTPS, so it survives networks that block everything else. That is why every serious client — including ours — keeps OpenVPN as the fallback even with WireGuard as the default.
OpenVPN's cost is overhead: a multi-round-trip TLS handshake, user-space packet copying, and on TCP the infamous TCP-over-TCP meltdown under packet loss (see our TCP vs UDP breakdown).
One operational note from our own fleet: OpenVPN 2.7 servers enable post-quantum key groups by default, which silently breaks older clients with a generic TLS handshake error. If you run your own server, read our TLS handshake troubleshooting guide.
Why do phones love IKEv2?
MOBIKE (RFC 4555). When your phone walks out of Wi-Fi range mid-video-call, IKEv2 migrates the existing tunnel to the cellular interface without renegotiating — the tunnel simply never drops. iOS implements IKEv2 natively in the operating system, which also means excellent battery behaviour: no third-party process needs to stay awake.
That is why our iOS and Android apps default to IKEv2 for always-on use, with WireGuard as the speed option and OpenVPN TCP as the escape hatch.
So which one should you actually pick?
- Desktop at home or office: WireGuard. Nothing else is close on throughput.
- Phone, always-on: IKEv2 — seamless network hopping, kernel-native, battery-friendly.
- Hotel / airport / office guest Wi-Fi / filtered countries: OpenVPN TCP on 443.
- Torrenting or big downloads: WireGuard, or OpenVPN UDP where WireGuard is blocked.
A good VPN should not make you choose in advance — it should expose all three and switch in one tap. That is exactly how we built Secure Paid VPN, and all three protocols are included on every plan.