Can a VPN Slow Down Your Internet? (And How to Fix It)

Virtual Private Networks (VPNs) have transitioned from niche corporate security tools to mainstream consumer apps. Whether you are working remotely from a coffee shop, trying to access geo-blocked streaming content, or simply want to protect your privacy from your ISP, millions of UK internet users now run a VPN 24/7.

But running a continuous VPN connection comes with a notorious side effect: It can significantly slow down your internet speed.

Why Does a VPN Slow Down Your Internet?

When you browse the web normally, data flows directly from your device, through your router, to your ISP, and out to the website. It is the most direct path possible.

When you turn on a VPN, you introduce a middleman. Your VPN app intercepts that data, scrambles it into an unreadable code (encryption), and routes it to a secure server owned by the VPN company. That server decrypts the data and sends it to the website on your behalf. This process causes slowdowns for three main reasons:

1. The Distance to the Server

Physical distance matters in networking. If you are sitting in London but tell your VPN to connect to a server in Tokyo so you can watch Japanese Netflix, your data suddenly has to travel halfway around the world and back again for every single click. This drastically increases your latency (ping) and lowers your download speed.

2. Encryption Overhead

Encrypting and decrypting data is a mathematically complex process. It requires processing power from both your device and the VPN server. This processing time, combined with the fact that encrypted data packets are physically larger than unencrypted ones ("encryption overhead"), directly eats into your maximum speed.

3. Server Congestion

If you are using a free VPN, or a low-quality paid tier, you are likely sharing a single VPN server with hundreds or thousands of other users. Just like a crowded highway, if the server doesn't have enough bandwidth capacity to handle everyone's traffic, everyone's speeds will slow to a crawl.

How Much Speed Loss is Normal?

You should always expect some level of speed loss when using a VPN. It is mathematically impossible for a VPN to be faster than your base, unencrypted broadband connection.

However, the severity of the drop depends entirely on the quality of the service:

• Premium, Paid VPNs (e.g., NordVPN, ExpressVPN, Surfshark): You should expect a minor speed drop of 5% to 15%. On a 100 Mbps connection, you likely won't even notice this reduction during daily browsing or streaming.
• Average Paid VPNs: It is completely normal for standard VPNs to reduce your speeds by 20% to 30%.
• Free VPNs: Free VPNs are notorious for aggressive throttling. It is common to see speed reductions of 50% to 80%, rendering high-speed broadband practically useless.

5 Ways to Speed Up Your VPN

If your VPN is aggressively bottlenecking your connection, don't just uninstall it. Try these five completely free fixes to claw back your bandwidth.

1. Switch to the WireGuard Protocol

This is the single biggest upgrade you can make. Open your VPN app's settings and look for the "Protocol" option. Historically, VPNs used OpenVPN or IKEv2. Today, the gold standard is WireGuard. It is a modern, incredibly lightweight protocol designed specifically for speed. Switching from OpenVPN to WireGuard can instantly double your VPN speeds.

2. Choose a Closer Server

Unless you are actively trying to bypass a geo-block in a specific country, you should always connect to the VPN server closest to your physical location. If you live in the UK, connect to a UK server (or specifically a London/Manchester server depending on your location). The shorter the physical distance, the faster the speed.

3. Turn on Split Tunneling

If your VPN provider supports it, use "Split Tunneling". This feature allows you to choose exactly which apps use the VPN and which bypass it. For example, you can route your confidential work email app through the secure VPN, but allow your bandwidth-heavy Steam game downloads to bypass the VPN and use your raw, unencrypted internet speed.

4. Try a Different Server in the Same Region

If you are connected to "London Server #1" and it feels sluggish, disconnect and manually select "London Server #5". The first server may simply be overloaded with peak-time traffic.

5. Switch to a Wired Connection

If you are running a VPN on a laptop over Wi-Fi, you are dealing with two separate layers of latency (Wi-Fi interference + VPN encryption). Plugging your laptop directly into your router via an Ethernet cable will establish a stable baseline connection, giving your VPN the maximum possible bandwidth to work with.