Does a VPN Affect Internet Speed?

Why a VPN slows things down

Three things happen to every packet inside a VPN tunnel:

1. Encryption — the CPU has to encrypt and decrypt every packet. Modern hardware barely notices, but cheap routers or phones can.
2. Extra hop — your traffic now goes: device → VPN server → internet (and back). The longer the route, the higher the latency.
3. Protocol overhead — every protocol adds bytes for headers, eating into your effective throughput.

Real-world numbers by protocol

What else affects VPN speed

• Server distance — a server 5,000 km away adds 80–150 ms of latency.
• Server load — if the server is at 90% capacity, you share bandwidth with everyone else.
• Your base speed — the slower your ISP line, the larger the relative impact.
• Encryption strength — AES-256-GCM is fast; older ciphers can be 30% slower.
• Wi-Fi vs ethernet — VPN + weak Wi-Fi + a far server is the worst combo.

How to make your VPN faster

1. Use WireGuard. Switch from OpenVPN to WireGuard in your app's settings.
2. Pick a nearby server. A server in the same country as you is usually 20–50 ms. Cross-Atlantic can be 200+.
3. Use a wired connection when possible — Wi-Fi adds jitter that compounds with VPN latency.
4. Avoid peak hours. Saturday night US-to-US traffic on a popular server is slow.
5. Try split-tunneling — route only the apps that need privacy through the VPN, leave the rest on the direct connection.