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WireGuard vs OpenVPN
WireGuard and OpenVPN are the two VPN protocols most worth understanding in 2026. WireGuard is faster and simpler. OpenVPN has a longer security track record and handles awkward network conditions better. For most users, the choice is already made for them: NordVPN uses WireGuard by default via its NordLynx implementation.
But if you are choosing a protocol manually, or just want to understand what is actually happening under the hood, the differences matter. This post covers speed, security, privacy quirks, and which protocol to use in which situation.
In this post
What WireGuard and OpenVPN Actually Are
Both are VPN protocols, meaning they define how your device creates an encrypted tunnel to a VPN server. The protocol determines what encryption is used, how the connection is established, and how traffic is routed.
OpenVPN has been around since 2001. It is open source, widely audited, and supported on essentially every platform and router. Its age is both a strength and a limitation: it carries a lot of legacy flexibility, which also means complexity.
WireGuard launched in 2015 and was integrated into the Linux kernel in 2020. It was built with a single goal: do less, faster. Its codebase is around 4,000 lines compared to OpenVPN’s 70,000 or more. That is not just a technical footnote. Fewer lines of code means a smaller attack surface and an easier codebase for security researchers to audit.
| Note: NordVPN supports both protocols. WireGuard runs via NordLynx (NordVPN’s custom implementation) and is the default on all platforms. OpenVPN is available in settings for users who need it. |
Speed: How Big Is the Difference?
WireGuard is significantly faster than OpenVPN. In independent tests, WireGuard consistently delivers speeds roughly three to four times higher than OpenVPN on the same connection. NordVPN’s own NordLynx implementation has achieved speeds exceeding 1,000 Mbps in controlled tests, compared to OpenVPN’s ceiling of around 400 Mbps.
The gap comes down to architecture. WireGuard runs in the operating system kernel, which means it processes traffic at a lower level with less overhead. OpenVPN runs in user space and requires more processing steps per packet.
For most everyday tasks, including browsing and standard definition video, the speed difference will not be perceptible on a fast home connection. Where it matters is on high-throughput tasks: 4K streaming, large file transfers, and gaming. On those, the WireGuard advantage is real and noticeable.
| Our take: If you are on NordVPN and seeing slower speeds than expected, check that NordLynx is selected as your protocol. It is the default, but worth verifying. Switching from OpenVPN to NordLynx typically produces an immediate and significant speed improvement. |
Security: Encryption and Code Size
Both protocols are secure. Neither has been broken in practice. But they approach security differently.
OpenVPN uses OpenSSL, which supports a wide range of encryption algorithms including AES-256. That flexibility is useful for organisations that need specific configurations, but it also means more complexity and more configuration decisions.
WireGuard uses a fixed, modern cryptographic suite: ChaCha20 for encryption, Poly1305 for authentication, Curve25519 for key exchange. There are no configuration options for the cryptography. That sounds like a limitation but it is actually a deliberate security decision: removing choices removes the risk of misconfiguration.
ChaCha20 is faster than AES-256 on devices without hardware AES acceleration (common on older phones and lower-end hardware). On devices with hardware acceleration, the two are roughly comparable in speed.
The codebase difference is significant for security. OpenVPN’s 70,000-plus lines of code have been reviewed extensively over more than two decades and have a long public audit history. WireGuard’s ~4,000 lines are easier to audit but have fewer years of scrutiny behind them. For most users, both represent a strong and comparable security baseline.
| Our take: OpenVPN’s long audit history gives security-focused users more confidence in its track record. WireGuard’s simpler codebase makes it easier to verify. For everyday VPN use, both are well beyond sufficient. |
The Privacy Caveat With WireGuard
WireGuard has one well-documented privacy limitation in its base implementation: it requires the server to store your IP address to maintain the VPN session. In the standard WireGuard protocol, your IP is logged on the server until the session ends.
For a privacy-focused VPN provider, that is a problem. NordVPN solves it with NordLynx, which adds a double NAT system on top of WireGuard. Your traffic passes through an intermediary layer that separates your real IP from the tunnel. The server never sees your actual IP address, and nothing is stored after the session ends.
This is why NordVPN built NordLynx rather than shipping raw WireGuard. If you are using a VPN provider that offers WireGuard without explaining how they handle this, it is worth asking.
| Note: This issue does not apply to OpenVPN in the same way. OpenVPN does not have a structural requirement to store IP addresses server-side. NordVPN’s no-logs policy applies to both protocols, but the technical implementation differs. |
Firewall Traversal and Network Compatibility
OpenVPN has a meaningful advantage on restricted networks. It can run over TCP on port 443, which is the same port used by standard HTTPS traffic. To a firewall or network administrator, it looks like ordinary web browsing. This makes OpenVPN significantly harder to block and easier to use on corporate networks, hotel Wi-Fi, and in countries with heavy internet filtering.
WireGuard uses UDP only. UDP is faster but easier for firewalls to block. On networks that restrict UDP traffic, WireGuard connections will fail where OpenVPN on TCP would succeed.
For most users on home or mobile connections, this is not a practical concern. For users in China, Iran, Russia, or on heavily managed corporate networks, it is worth knowing that OpenVPN is the more reliable fallback.
| Practical tip: If you are travelling to a country with VPN restrictions or frequently use VPNs on corporate networks, keep OpenVPN as a fallback in your NordVPN protocol settings. NordLynx is the right default for everyday use, but OpenVPN over TCP is the right tool for getting through restrictive firewalls. |
WireGuard vs OpenVPN: Full Comparison
Here is how the two protocols compare across the factors that matter most for VPN users.
| WireGuard | OpenVPN | |
| Code size | ~4,000 lines | ~70,000+ lines |
| Speed | Significantly faster | Slower due to overhead |
| Encryption | ChaCha20 / modern suite | AES-256 / OpenSSL |
| Protocols supported | UDP only | UDP and TCP |
| Firewall traversal | Can be blocked on UDP | TCP 443 bypasses most firewalls |
| Audit history | Newer, fewer audits | Long track record of public audits |
| Privacy (static IPs) | Requires extra steps | No static IP issue |
| Platform support | All major platforms | All major platforms |
| Best for | Speed, streaming, daily use | Security-first, restricted networks |
| Used by NordVPN? | Yes (via NordLynx) | Yes (available in settings) |
Both protocols are available on NordVPN. Check current plan pricing.
| Our take: WireGuard wins on speed and simplicity. OpenVPN wins on firewall flexibility and audit history. For daily use, WireGuard (via NordLynx) is the right default. For restricted networks or security-critical environments, OpenVPN is the better fallback. |
What NordVPN Does With WireGuard (NordLynx)
NordLynx is NordVPN’s implementation of WireGuard with two additions: a double NAT system that prevents IP address logging, and integration with NordVPN’s wider infrastructure including the no-logs policy, Threat Protection, and kill switch.
The result is that NordLynx gives you WireGuard’s speed without the privacy limitation. NordVPN tested extensively before making NordLynx the default protocol, and independent speed tests consistently show it as one of the faster VPN implementations available.
From a user perspective, you do not need to configure anything. NordLynx is selected automatically. If you want to switch to OpenVPN for any reason (firewall traversal, personal preference, legacy device compatibility) it is available in the protocol settings on all platforms. For more on why NordVPN is worth it beyond the protocol choice, see our full breakdown.
Which Protocol Should You Use?
The short answer for most NordVPN users: stay on NordLynx. It is faster, the privacy issue has been solved, and it is the default for good reason.
Not yet on NordVPN? The 2-year plan is where the price drops to around $3 to $4 per month. That is where the value is. You can also check our free VPN vs paid VPN breakdown if you are still deciding whether to pay for a VPN at all.
Switch to OpenVPN when:
- You are on a network that blocks UDP traffic (corporate networks, hotel Wi-Fi, countries with VPN restrictions).
- You need TCP 443 specifically to make the connection look like regular HTTPS traffic.
- You are using an older device or router that does not support WireGuard natively.
- You are in a security-critical environment and want the longer audit history that OpenVPN carries.
Stay on NordLynx (WireGuard) when:
- You want the fastest possible connection for streaming, gaming, or large downloads.
- You are on a standard home, office, or mobile connection without restrictive firewall rules.
- You want the simplest, lowest-overhead setup for everyday use.
FAQs
Is WireGuard safer than OpenVPN?
Both are secure. WireGuard’s smaller codebase makes it easier to audit and reduces the potential attack surface. OpenVPN has a longer public audit history. For most users, both represent a strong security baseline. The choice between them is more about speed and network compatibility than safety.
Why is WireGuard faster than OpenVPN?
WireGuard runs in the operating system kernel rather than in user space, which reduces processing overhead per packet. It also uses a leaner cryptographic suite with fewer steps. The practical result is significantly higher throughput on the same connection.
Does NordVPN use WireGuard?
Yes. NordVPN uses WireGuard via its NordLynx protocol, which adds a double NAT system to address WireGuard’s default IP logging behaviour. NordLynx is the default protocol on all NordVPN platforms. OpenVPN is also available in settings.
What is NordLynx?
NordLynx is NordVPN’s custom implementation of WireGuard. It adds a double NAT layer so that your real IP address is never stored on the VPN server, resolving the main privacy limitation of standard WireGuard. It is the fastest protocol NordVPN offers.
When should I use OpenVPN instead of WireGuard?
Use OpenVPN when you are on a network that blocks UDP traffic, such as corporate networks, hotel Wi-Fi, or in countries with heavy internet filtering. OpenVPN can run over TCP on port 443, which makes it much harder to block.
Can OpenVPN bypass firewalls better than WireGuard?
Yes, in most cases. OpenVPN over TCP on port 443 is difficult to distinguish from ordinary HTTPS traffic, which makes it significantly harder for firewalls and network administrators to detect and block. WireGuard uses UDP only, which is easier to block.
