kemangVPNBlog · 18 Sept 2026
Why a VPN Slows Down Your Internet Connection, and How to Fix It
A VPN always adds some overhead to your connection. Here is what causes it, how much slowdown is normal, and how to keep it to a minimum.
This question comes up all the time: why does the internet feel slower after turning on a VPN? The short answer is that it is normal, up to a point. What you need to know is how much slowdown is normal, and when it is no longer reasonable.
Three main causes
1. Encryption takes time
Every data packet is encrypted before it is sent and decrypted after it is received. The process is fast, but it still uses some processing power. On modern laptops and phones the effect is small. On weaker devices, such as cheap routers or old phones, it becomes noticeable.
2. Distance to the server
This is usually the biggest factor. Without a VPN, your data takes the shortest path to its destination. With a VPN, it first has to pass through the VPN server. If that server is on another continent, your data travels a much longer distance, and that shows up immediately as higher latency.
3. Server and network load
A VPN server is shared by many users. If a server is busy, or the route to it is congested, the speed you get drops too.
How much slowdown is normal
With a geographically close server and a modern protocol, the speed drop is usually in the range of 10 to 20 percent, often unnoticeable in everyday use. Latency increases by a few milliseconds to a few tens of milliseconds.
If you choose a server on another continent, it is a different story. Latency can rise by hundreds of milliseconds, which is clearly noticeable in activities that are sensitive to delay.
One thing worth clearing up: a VPN cannot make your connection faster than the speed your ISP provides. The upper limit is still the speed of your internet plan.
How to minimize the slowdown
Choose the nearest server
This is the step with the biggest impact and the easiest to take. If you are in Indonesia and have no particular reason to pick a specific country, the Jakarta server almost always gives the best results. See the server locations list.
Use a lightweight protocol
WireGuard is generally faster and more power-efficient than older protocols. If your device supports it, use it. There is a full explanation in our protocol comparison article.
Try another server in the same country
If one server feels slow, another server in the same country often performs differently because its load and route are not the same.
Check your WiFi
Often the slow part is not the VPN but the WiFi signal. Try comparing with a wired connection, or move your device closer to the router, before drawing conclusions.
When the slowdown is not normal
If speed drops drastically, for example to a small fraction of your speed without the VPN, there is usually a specific cause, not just encryption overhead. The most common ones: the server is too far away, the VPN is running on a router with a weak processor, or there is a problem on your ISP's route to a particular server.
A useful way to check: measure your speed without the VPN, then with the VPN on the nearest server, then with the VPN on a different server. Those three numbers are usually enough to show where the problem lies.
Still having trouble? See our connection help guide.
About kemangVPN
kemangVPN is a subscription VPN service built for Indonesia: 84 servers in 45 countries including Jakarta, AES-256 encryption, no activity logging, and 10 devices on one account.
Plans start at US$3.99 a month, paid via PayPal; rupiah payments (QRIS, bank transfer) are available when you order in IDR. Activation is instant once payment is confirmed, with a 7-day money-back guarantee.