TL;DR: Every VPN slows your internet a little because of encryption and the extra hop to the VPN server. With WireGuard and a nearby server, the loss is typically 5–10% — unnoticeable in daily use. If you're losing more than 40%, change your server, protocol, or provider.
One of the most common complaints about VPNs is "it slows down my internet." And it's true: any VPN inevitably reduces speed. But the difference between "barely noticeable" and "unusable" is huge. In this article, we'll explain why a VPN affects speed and give concrete tips to minimize the impact.
Why speed drops: the technical explanation
Data encryption
A VPN's main job is to encrypt your traffic. Every packet sent through the VPN is encrypted on your device and decrypted on the VPN server (and vice versa). That requires CPU cycles. On modern devices, encryption adds minimal latency, but on older smartphones or budget laptops the effect can be noticeable.
The extra hop
Without a VPN, your traffic goes directly: device → ISP → destination server. With a VPN, an intermediate hop appears: device → ISP → VPN server → destination server. That's an extra detour that lengthens the data path. If the VPN server is in another country, latency goes up even more.
VPN server load
Every VPN server handles many users at the same time. If the server is overloaded, its bandwidth is split between all connected clients, and each user's speed drops. This is especially common on free VPNs, where there are few servers but thousands of users.
The VPN protocol
Different protocols affect speed differently. OpenVPN runs in user space and processes every packet through an application — that's slower. WireGuard runs inside the operating system kernel and uses more efficient cryptography — it's 30–50% faster.
How to minimize the speed loss
1. Pick the closest server
The closer the VPN server is to your real location, the lower the latency. If you don't need an IP from a specific country, connect to a server in your own country or the nearest one. The difference can be 50–100 ms of ping and 20–30% of speed.
2. Use WireGuard
If your VPN provider offers WireGuard, pick it. It's the fastest protocol available today. Speed loss with WireGuard is usually 5–10%, compared with 20–40% for OpenVPN.
3. Set up split tunneling
You don't have to push all your traffic through the VPN. With app filtering, you can route only what needs protection (browser, messenger) through the VPN and send the rest (system updates, cloud sync) directly. That reduces the load on the VPN tunnel and increases overall speed.
4. Try different servers
Even servers in the same country can have different loads. If your current server is slow, switch to another. Many VPN apps show server load or ping, which helps you pick the right one.
5. Check your baseline speed
Sometimes the problem isn't the VPN but the internet connection itself. Measure your speed without a VPN (at speedtest.net), then with the VPN. If your baseline speed is low, a VPN can't do much to fix it. Contact your ISP.
6. Update your VPN app
Developers regularly optimize their apps. An outdated version may run slower than a new one due to unoptimized code or stale defaults.
What's a normal speed loss?
Use these benchmarks:
- 5–10% — excellent. You won't notice it in everyday use.
- 10–20% — good. Fine for streaming and video calls.
- 20–40% — acceptable but noticeable. Worth trying a different server or protocol.
- More than 40% — there's a problem. Switch VPN providers or check your settings.
When a VPN can actually speed up your internet
Paradoxically, in some cases a VPN can increase your speed. This happens when your ISP artificially throttles certain traffic types — like torrents or streaming. A VPN encrypts your traffic so the ISP can't identify its type, and therefore can't throttle it.
LiMP VPN and speed
LiMP VPN uses WireGuard by default, which keeps the speed loss minimal. Servers are optimized for high load, and automatic server selection connects you to the nearest and least-loaded node. Combined with split tunneling, you get maximum speed with full protection.
Conclusion
A VPN inevitably slows your internet, but the right settings reduce the loss to a minimum. Pick the closest server, use WireGuard, set up split tunneling, and keep your app updated. With LiMP VPN, the speed loss is just 5–10% — imperceptible for everyday use.