Yes — technically. A VPN adds encryption and reroutes your traffic through an extra server, which introduces some overhead. But in 2026, with modern protocols like WireGuard, the difference is often negligible for everyday use. This guide explains exactly how much, why, and what you can do about it — with real speed figures from our testing.
When you browse without a VPN, your device connects directly to websites — the shortest possible path. When you use a VPN, every packet of data takes an extra journey: from your device to the VPN server, then on to its destination, then back the same way. This adds two legs to every round trip.
On top of the extra distance, your device and the VPN server must encrypt and decrypt everything. AES-256 encryption is computationally intensive — though modern processors handle it quickly enough that on a fast device it is rarely the limiting factor.
The result is some combination of higher latency (the delay before data starts flowing) and potentially lower throughput (the total volume of data per second). Both effects are real. Whether they matter depends on what you are doing and which VPN you choose.
The honest short answer: a VPN will slow your internet. With a good VPN and WireGuard protocol on nearby servers, the difference in everyday use is often below what you would notice. With a poor VPN or distant servers, it can be significant.
We tested all 8 VPNs in our review set on a UK gigabit connection (1,000 Mbps), using WireGuard where available, connecting to UK servers. These are the consistent results we observed across multiple sessions:
| VPN | Protocol | UK Speed | US Speed | Rating |
|---|---|---|---|---|
| NordVPN | NordLynx | 500–600 Mbps | 200–300 Mbps | Excellent |
| ExpressVPN | Lightway | 400–500 Mbps | 180–280 Mbps | Very good |
| Surfshark | WireGuard | 280–350 Mbps | 120–200 Mbps | Good |
| CyberGhost | WireGuard | 250–320 Mbps | 110–180 Mbps | Good |
| Proton VPN | WireGuard | 240–310 Mbps | 100–170 Mbps | Good |
| PIA | WireGuard | 200–280 Mbps | 90–160 Mbps | Adequate |
| PureVPN | WireGuard | 180–250 Mbps | 80–150 Mbps | Adequate |
| IPVanish | WireGuard | 200–260 Mbps | 85–155 Mbps | Adequate |
To put those numbers in context — streaming 4K video requires around 25 Mbps. A video call needs 3–8 Mbps. Even the slowest VPN in our test set delivered more than ten times what you need for 4K streaming on UK servers.
Protocol choice is the single biggest factor in VPN speed — more significant than the provider in many cases. The difference between WireGuard and older protocols is dramatic:
If speed is a concern, ensure your VPN is set to WireGuard (or NordLynx or Lightway, which are WireGuard-based). Most modern VPN apps default to the fastest available protocol automatically — but it is worth checking in the settings.
Physics is unavoidable. Data cannot travel faster than the speed of light, and the longer the physical distance between you and the VPN server, the higher the latency. Connecting to a UK server from the UK adds minimal latency. Connecting to a server in Australia adds significant latency — typically 200–300ms round trip, which is noticeable for anything interactive.
For everyday browsing and streaming, latency below 100ms is imperceptible. For online gaming, anything above 50ms can be noticeable. Connect to the nearest server for the best performance — always use a local server unless you specifically need to appear to be in another country.
For the vast majority of everyday internet use — browsing, streaming, calls, downloads — a good VPN using WireGuard on a nearby server will not meaningfully slow your experience. NordVPN is the fastest we tested by a clear margin. If speed is your top priority, it is the right choice.
NordVPN using NordLynx was the fastest VPN we tested — consistently delivering 500+ Mbps on UK servers. Our full review covers speed, privacy, streaming and value.
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