How VPNs Affect Your Internet Speed: Test Results and Recommendations

The Cost of Total Privacy

A Virtual Private Network (VPN) is an essential tool for digital privacy. By creating an encrypted tunnel between your device and a remote server, a VPN hides your IP address, secures your data on public Wi-Fi, and bypasses geographic content restrictions. However, this level of security requires complex mathematical encryption, and that process inevitably exacts a toll on your internet speed.

A common myth is that a VPN will "destroy" your connection speed. The reality is highly nuanced. If configured correctly with modern protocols, the speed loss can be practically imperceptible.

The Three Factors That Determine VPN Speed

1. Physical Distance to the VPN Server

This is the laws of physics at work. If you are in New York and you connect to a VPN server in New York, the data travels a negligible distance, and your ping might only increase by 2-5 milliseconds. However, if you are in New York and you connect to a VPN server in Tokyo to watch Japanese Netflix, your data must cross the Pacific Ocean twice.

The Impact: Cross-continental VPN connections will cause your ping to skyrocket (often exceeding 200ms) and your maximum download bandwidth to plummet due to TCP window scaling limitations over long distances. Always choose the geographically closest VPN server unless you specifically need to spoof another country.

2. Server Load and Bandwidth Capacity

Not all VPN providers are created equal. Free VPNs are notorious for packing thousands of users onto a single, low-bandwidth server. If the VPN server only has a 1 Gbps connection to the internet, and 500 people are trying to stream HD video through it simultaneously, your speeds will crawl at dial-up rates.

The Solution: Premium VPN providers (like Mullvad, ProtonVPN, or NordVPN) rent enterprise-grade servers with 10 Gbps or even 40 Gbps uplinks, ensuring that the server itself never becomes a bottleneck for your connection.

3. The Encryption Protocol (The Game Changer)

The protocol is the specific set of mathematical rules the VPN uses to encrypt your data. The choice of protocol dictates how heavily your computer's CPU has to work to encrypt and decrypt the traffic.

• OpenVPN: The old industry standard. It is highly secure but incredibly "heavy." It only utilizes a single CPU core. On a Gigabit (1000 Mbps) connection, OpenVPN will typically cap out at 200-300 Mbps simply because standard CPUs cannot process the encryption math fast enough.
• WireGuard: The modern revolution in VPN technology. WireGuard is a lightweight, highly optimized protocol built directly into the Linux kernel. It is incredibly efficient. In real-world tests on a Gigabit fiber connection, WireGuard routinely achieves 800-900 Mbps throughput, representing a negligible 10% speed loss.

Can a VPN Make Your Internet Faster?

In 99% of cases, a VPN will slow down your connection due to overhead. However, there are two specific edge cases where a VPN can actually increase your speed:

1. Bypassing ISP Throttling: As discussed in our throttling guide, if your ISP is artificially capping Netflix at 5 Mbps, turning on a VPN hides the traffic type. Your speed might jump from the throttled 5 Mbps to your VPN's maximum throughput of 300 Mbps, effectively "speeding up" the stream.
2. Fixing Bad ISP Routing: If your ISP routes traffic to a specific game server through an incredibly inefficient path causing high ping, connecting to a VPN server located right next to the game server can force your traffic onto a more direct, lower-latency backbone, reducing your ping.

Hardware VPNs vs. Software VPNs

Running a VPN app on your modern iPhone or Intel Core i7 laptop is easy because those devices have massively powerful processors capable of handling WireGuard encryption effortlessly.

However, if you install a VPN directly onto your home Wi-Fi router (to protect your smart TVs and IoT devices), you will likely experience a massive speed drop. Standard consumer routers have very weak CPUs (often just dual-core ARM chips). If you force a standard $100 router to encrypt all your home's traffic via OpenVPN, it will likely buckle and cap your entire home's internet speed at 30-50 Mbps. If you want network-wide VPN protection without sacrificing speed, you must invest in a high-end, x86-based router (like a custom pfSense box).