VPN Protocol Comparison
Your VPN protocol decides how fast, secure, and stable your connection is. Here's how the major protocols compare, based on our ratings and each protocol's documented design.
Protocols at a Glance
| Protocol | Speed | Security | Stability | Codebase | Best For |
|---|---|---|---|---|---|
| WireGuard | Fastest | Excellent | Excellent | ~4,000 lines | Everyday use, mobile, streaming |
| NordLynx | Fastest | Excellent | Excellent | WireGuard-based | NordVPN users wanting max speed |
| Lightway | Very fast | Excellent | Excellent | ~2,000 lines | ExpressVPN users, quick reconnects |
| IKEv2/IPsec | Fast | Very good | Excellent (mobile) | Moderate | Mobile switching between Wi-Fi/cellular |
| OpenVPN UDP | Moderate | Excellent | Very good | ~70,000+ lines | Routers, compatibility |
| OpenVPN TCP | Slower | Excellent | Excellent | ~70,000+ lines | Restrictive networks (port 443) |
WireGuard (and NordLynx, Lightway)
WireGuard is the modern standard - lean, fast, and easy to audit at roughly 4,000 lines of code. NordVPN's NordLynx builds on it and topped our speed testing at 89% retention. ExpressVPN's Lightway is a separate lightweight protocol (~2,000 lines) built for fast connections and instant reconnects. For everyday use, streaming, and mobile, a WireGuard-based protocol is the right default.
IKEv2/IPsec
IKEv2 is fast and exceptionally stable on mobile, where it shines at handing your connection off between Wi-Fi and cellular without dropping. It's a strong second choice on phones when a WireGuard-based option isn't available, though it's slightly less flexible on desktop and routers.
OpenVPN (UDP and TCP)
OpenVPN is the veteran: nearly two decades old, heavily audited, and compatible with almost every device and router. It's slower than WireGuard - 15-25% in our ratings - but its maturity and firewall-evading TCP-over-443 mode keep it relevant. Use UDP for speed and TCP only when you need reliability on restrictive networks.
Which Protocol Should You Pick?
- Fastest everyday performance: WireGuard / NordLynx / Lightway
- Best on mobile with network switching: IKEv2/IPsec or WireGuard
- Gaming (lowest latency): NordLynx / WireGuard
- Routers and maximum compatibility: OpenVPN UDP
- Bypassing strict firewalls: OpenVPN TCP over port 443
The good news: modern VPN apps auto-select the best protocol for your situation, so you rarely need to change it manually. If you want the fastest option out of the box, NordVPN's NordLynx led every speed test we ran.
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