Quick answer
A VPN does add some overhead, because your traffic is encrypted and takes a detour through a server. With a modern protocol like WireGuard and a nearby, lightly loaded server the difference is usually a few percent, which you will not notice in normal use. Speed drops noticeably when the server is far away or overloaded. SecureNet's Automatic mode picks the nearest healthy server with the least load for exactly this reason, and the built-in speed test lets you check the numbers yourself.
Key facts
- Encryption overhead with WireGuard is small, typically a few percent.
- Distance is the big factor. Every packet travels to the server and back before reaching its destination.
- Server load matters as much as distance. A close but crowded server loses to a slightly farther empty one.
- Automatic in SecureNet picks by latency and load, not just by country.
- Measure, do not guess. SecureNet's speed test shows latency, download and upload through the tunnel.
Where the slowdown comes from
Three things add up to the difference between your speed with and without a VPN. They are not equal, and only one of them is about the VPN itself.
1. Encryption
Every packet is encrypted on your device and decrypted at the server. This costs processor time and adds a few bytes per packet. With WireGuard this is cheap: modern phones encrypt at speeds far beyond any consumer connection, so this is rarely the bottleneck.
2. Distance
Your traffic goes to the VPN server first, then on to the website, and the reply makes the same trip in reverse. If the server is in the next city, that adds a few milliseconds. If it is on another continent, it adds a hundred or more, and every page load and every video call feels it. This is the factor people underestimate.
3. Server load
A server shared with too many people slows down for all of them. A server 500 kilometres away with ten users will usually beat one 50 kilometres away with a thousand. You cannot see load from the outside, which is why the app should.
What SecureNet does about each
| Factor | What SecureNet does |
|---|---|
| Encryption | WireGuard only, the lightest protocol available |
| Distance | Automatic picks by measured latency to you, not by country name |
| Load | Servers report health and load; Automatic avoids the busy ones, and the server list shows load for each |
In the Servers tab every server shows a health badge and a load percentage. If you pick a server manually, those two numbers are what to look at. When in doubt, Automatic already looked at them. Our guide to choosing a server goes deeper.
How to measure it properly
- Open Settings, then Speed test. SecureNet measures latency, download and upload through the tunnel to the server you are connected to.
- Run it once connected and once disconnected. The difference is the VPN's real cost on your current network. Do it on the same Wi-Fi within a few minutes.
- Try one other server. If Automatic's pick is slower than expected, a neighbouring country is a one-tap experiment.
- Ignore the absolute numbers on cellular. Mobile speeds vary minute to minute regardless of the VPN. Compare, do not benchmark.
If your connection is 100 megabits and the VPN gives you 92, you have lost nothing you can feel. If it gives you 30, you are on the wrong server, not the wrong VPN.
When a VPN makes things faster
Occasionally the VPN speeds things up. Some networks throttle specific kinds of traffic, such as video, and cannot do that when the traffic is inside an encrypted tunnel they cannot classify. And a poorly routed connection to a distant service can sometimes be improved by exiting from a server with a better path. Neither is the normal case, but neither is rare.
Battery
The same design choices that keep WireGuard fast keep it light on battery. Leaving SecureNet connected all day is not something you should expect to see in battery statistics. If you do, check whether an app behind the tunnel is the one doing the work.
Frequently asked questions
How much slower is a VPN?
With WireGuard and a nearby, lightly loaded server, typically a few percent. With a distant or crowded server, it can be much more. Server choice matters more than the VPN itself.
Why is my VPN slow today when it was fast yesterday?
Most likely the server got busy or your network changed. Reconnect with Automatic, or pick a server with lower load in the Servers tab.
Does the VPN slow down video calls?
Calls care about latency more than bandwidth. Pick a nearby server and the added delay is a few milliseconds, which no one on the call will notice.
Does SecureNet have a speed test?
Yes. Settings has a built-in speed test that measures download, upload and latency through the tunnel.