WireGuard vs OpenVPN: speed, security, and when each wins

WireGuard and OpenVPN are the two open-source protocols behind most VPN connections — the rulebooks your app and the server follow to build the encrypted tunnel. Every one of the eight providers in our full VPN rankings supports WireGuard; seven of the eight also run OpenVPN. Both encrypt your traffic and hide your IP. They differ in speed, battery cost, firewall behavior, and what hardware they run on — and those differences decide which one you should be using.

What actually separates WireGuard and OpenVPN?

Size and philosophy. WireGuard is a minimalist: roughly 4,000 lines of code against OpenVPN’s roughly 70,000. PCMag and Nira both highlight that gap because a small codebase is easier to audit and leaves fewer places for bugs to hide.

The encryption follows the same split. WireGuard is fixed — ChaCha20 for encryption, Poly1305 for authentication, nothing to negotiate. OpenVPN is configurable: it supports multiple cipher suites, including AES and ChaCha20-Poly1305, plus older options kept for legacy compatibility. That flexibility is OpenVPN’s core argument. It bends to compliance requirements, old routers, and awkward NAT edge cases that WireGuard’s opinionated design refuses to accommodate.

WireGuard vs OpenVPN at a glance (published comparisons and benchmarks, accessed 23 Jul 2026)

	WireGuard	OpenVPN
Codebase size	About 4,000 lines	About 70,000 lines
Transport	UDP only	UDP or TCP, including TCP port 443
Encryption	Fixed: ChaCha20 + Poly1305	Configurable: AES, ChaCha20-Poly1305, older suites
Throughput (one 2026 test, 1 Gbps line)	940 Mbps	480 Mbps
CPU and battery use	Lower	Higher
Switching Wi-Fi to cellular	Reconnects quickly	Slower to re-establish
Strict firewalls	Weaker — UDP is easy to block	Stronger — TCP 443 blends with HTTPS
Setup	Simple, few options	Flexible, more complex

How much faster is WireGuard?

About twice as fast in the most direct published test. A 2026 benchmark on a 1 Gbps line recorded 940 Mbps through WireGuard against 480 Mbps through OpenVPN. Cybernews puts the everyday gap at roughly 52% on downloads and 17% on uploads; PCMag calls WireGuard “far and away the best choice” for speed, and RTINGS reports significantly faster downloads too.

OpenVPN is closing some of the distance. Version 2.6 added data channel offload (DCO), which a 2026 Datazone benchmark credits with a marked improvement — while concluding it still trails WireGuard and stays more complex to run.

Two caveats those numbers hide. They are third-party results, not ours — this site runs no benchmarks. And the gap you personally see depends on server distance, hardware, and how your provider implements each protocol. For what a VPN does to your connection overall, see does a VPN slow down your internet.

Why is WireGuard better on phones?

It does less work and recovers faster. Published comparisons — including an academic study hosted by Glasgow Caledonian University — consistently report lower CPU use, less battery drain, and less mobile data burned than OpenVPN.

It also survives network changes. Walk out of Wi-Fi range onto cellular and WireGuard re-establishes the tunnel quickly; OpenVPN is slower to reconnect. That combination is why reviewers point phone users at WireGuard by default.

When is OpenVPN still the better choice?

When the network fights you. WireGuard runs over UDP only. OpenVPN runs over UDP or TCP — and on TCP port 443 it travels the same port and transport as ordinary HTTPS, which gets it through firewalls and censored networks that block or throttle UDP. Hotel Wi-Fi, strict corporate networks, and countries that restrict VPN traffic are where OpenVPN earns its keep.

Compatibility is the second reason. OpenVPN’s maturity makes it the protocol that old routers, firewalls, and compliance-bound setups actually speak. Mullvad made the cost of dropping it concrete: it removed OpenVPN entirely — client and server side — on 15 January 2026, and router and third-party setups that depended on it stopped connecting. Our Mullvad review covers what that all-in bet on WireGuard buys and breaks.

Is one more secure than the other?

Neither wins outright. The sources in our research treat both as secure: WireGuard’s case is the small, auditable codebase and fixed modern cryptography; OpenVPN’s case is maturity, configurability, and the option to blend in with HTTPS traffic.

Privacy is decided elsewhere. No comparison we found crowns either protocol for privacy — both protect traffic in transit, and neither protects you from a provider that logs. A published no-logs audit tells you more about a VPN than its protocol list; no-log VPN audits explained shows how to read one.

Providers also rarely ship bare WireGuard. NordVPN built NordLynx on the WireGuard framework with a custom double-NAT system and added post-quantum encryption in 2025. Mullvad layers quantum-resistant tunnels and DAITA traffic obfuscation on top of it. ExpressVPN ships a customized WireGuard with post-quantum protection alongside Lightway, its own open-source protocol.

Which providers run which protocol?

Protocol support at the eight providers we track (as of 23 Jul 2026)

Provider	WireGuard	OpenVPN	Other protocols
NordVPN	NordLynx — WireGuard-based, post-quantum since 2025	Yes	—
ExpressVPN	Customized, with post-quantum protection	Yes	Lightway (default, in-house), IKEv2
Surfshark	Yes	Yes	IKEv2
Proton VPN	Yes	Yes — UDP and TCP	Stealth (custom obfuscation)
Mullvad VPN	Yes — the only protocol	Removed 15 Jan 2026	Quantum-resistant tunnels, DAITA on top of WireGuard
CyberGhost	Yes	Yes	IKEv2
Private Internet Access	Yes	Yes	IKEv2/IPsec on the server list
Windscribe	Yes	Yes	IKEv2, Stealth, WSTunnel

Three details stand out. Mullvad is the only provider here with no OpenVPN at all — a clean bet on WireGuard that costs it router compatibility. ExpressVPN defaults to Lightway, its own protocol written in Rust with post-quantum ML-KEM, and offers its customized WireGuard on Windows, macOS, Linux, iOS, Android, and Apple TV. And for hostile networks, Proton VPN runs OpenVPN over both UDP and TCP plus Stealth, its custom obfuscation protocol.

Which one should you use?

Choose WireGuard if:

• Speed matters most — streaming, gaming, large downloads.
• You are on a phone: less battery, less data, faster recovery when networks change.
• You want a setup with fewer options to get wrong.

Choose OpenVPN if:

• Your network blocks UDP — OpenVPN over TCP port 443 is the standard way through strict firewalls and censorship.
• Your router or older hardware only speaks OpenVPN.
• You need TCP transport or fine-grained configuration for a compliance-bound setup.

If neither list applies, keep your app’s default. WireGuard has become the standard choice for new setups, with OpenVPN as the deliberate fallback for the edge cases above.

Frequently asked questions

Frequently asked questions

Is WireGuard faster than OpenVPN?

Yes, in every published comparison in our research. One 2026 benchmark measured 940 Mbps through WireGuard against 480 Mbps through OpenVPN on the same 1 Gbps line, and Cybernews reports roughly 52% faster downloads. OpenVPN 2.6 narrowed the gap with data channel offload but still trails.

Is WireGuard more secure than OpenVPN?

Not universally. Both are treated as secure. WireGuard has a smaller codebase that is easier to audit — about 4,000 lines against roughly 70,000 — while OpenVPN is older, more configurable, and more mature. The provider behind the protocol matters more than the protocol itself.

Does OpenVPN work on TCP, and does WireGuard?

OpenVPN runs over both TCP and UDP; WireGuard runs over UDP only. That matters on restrictive networks: OpenVPN on TCP port 443 uses the same port and transport as ordinary HTTPS, so it can pass firewalls that block UDP.

Is WireGuard better for mobile devices?

Yes. It reconnects faster when you move between Wi-Fi and cellular, and it uses less CPU, battery, and mobile data than OpenVPN. Reviewers consistently recommend it as the default protocol on phones.

Which uses less battery or data?

WireGuard. Its lighter design means lower CPU load and less overhead, which published comparisons consistently translate into longer phone battery life and less mobile data used than OpenVPN.

Is OpenVPN still worth using in 2026?

Yes, in specific situations: networks that block UDP, routers and older hardware that only support OpenVPN, and setups that need TCP transport or fine-grained configuration. For everything else, WireGuard is the simpler and faster pick.

Should I use WireGuard or OpenVPN for streaming and gaming?

WireGuard. Its higher throughput and lower latency make it the usual recommendation for both. Switch to OpenVPN only when the network blocks the UDP traffic WireGuard needs.