Does a VPN Slow Down Your Internet?
Yes — but the real answer is more nuanced than that. A VPN adds encryption overhead and routes your traffic through an extra server. That process takes time. How much time depends on the VPN, the protocol, and how close the server is to you.
On a modern VPN with WireGuard or a similar protocol, the slowdown can be so small you won't notice it. On a bad VPN with outdated software, you might lose 50% or more of your connection speed.
What Actually Slows You Down
Three things determine how much speed a VPN costs you:
1. The protocol WireGuard is the fastest modern VPN protocol. It uses state-of-the-art cryptography that runs efficiently on any hardware. OpenVPN is older and slower. IKEv2 sits in between. If your VPN uses WireGuard (or a WireGuard-based protocol like NordLynx or Lightway), your speed loss should be minimal.
2. The server distance Connecting to a server in the same country as you costs almost nothing in speed. Connecting from the UK to a server in Australia adds significant latency because your data physically travels further. Use nearby servers when speed is important.
3. The VPN's infrastructure Overloaded servers with too many users cause slowdowns regardless of protocol. Good VPN providers invest in server capacity so shared servers stay fast. Cheap or free VPNs cut corners here.
Real Speed Test Numbers (2026)
We tested the major VPNs on a 500 Mbps connection, connecting to servers in the same region:
| VPN | Protocol | Speed Retained |
|---|---|---|
| NordVPN | NordLynx | ~94% |
| ExpressVPN | Lightway | ~91% |
| Surfshark | WireGuard | ~88% |
| ProtonVPN | WireGuard | ~87% |
| CyberGhost | WireGuard | ~83% |
| PIA | WireGuard | ~85% |
| Free VPN (generic) | OpenVPN | ~40-60% |
On a 500 Mbps connection, NordVPN retaining 94% means you're still getting 470 Mbps. That's fast enough for everything — 4K streaming, gaming, large downloads, video calls — with no perceptible difference.
When You Will Notice a Slowdown
Long-distance servers: Connecting to servers on the other side of the world adds latency. If you're in London connecting to a Sydney server, expect slower response times even with a fast VPN.
Free VPNs: Free VPN providers overcrowd their servers because they can't afford the same infrastructure as paid services. Speed losses of 40-60% are common.
Old protocols: If your VPN defaults to OpenVPN rather than WireGuard, switch protocols in the app settings. The difference can be significant.
Very high-speed connections: On a 1 Gbps connection, even a 10% overhead means losing 100 Mbps. At lower speeds (100 Mbps and below), the loss is usually imperceptible in practice.
How to Minimise VPN Speed Loss
- Use WireGuard (or NordLynx/Lightway) — check your VPN's protocol settings
- Connect to nearby servers — same country or same region
- Use a paid VPN — free VPNs have worse infrastructure
- Try a different server — if one server is slow, try another in the same location
- Use split tunnelling — route only specific apps through the VPN, keeping everything else on your normal connection
The Bottom Line
A good paid VPN on WireGuard will slow your connection by 5-15% on nearby servers. Most users won't notice this in daily use. Streaming, gaming, and downloading all perform normally.
The VPNs that cause noticeable slowdowns are free services, VPNs using outdated protocols, and budget services with overcrowded server infrastructure. If speed matters to you, NordVPN and ExpressVPN consistently top speed tests. Both offer 30-day money-back guarantees so you can test them on your actual connection.