Proton VPN Review 2026

During our deep-dive audit of Proton VPN, the defining infrastructure characteristic is its Secure Core architecture—traffic is first routed through hardened servers physically located in former military bunkers in Iceland and Switzerland before exiting through a standard endpoint. Swiss jurisdiction places Proton outside the 5/9/14-Eyes intelligence-sharing agreements, and the company's GDPR obligations are governed by Swiss Federal Data Protection law, not EU directives. Every client application is fully open-source and has been audited by SEC Consult, with audit reports published in full.

The VPN Accelerator technology addresses WireGuard's known single-core CPU bottleneck by splitting packet processing across multiple cores using processor affinity tuning, combined with a custom transport layer that reduces protocol overhead on high-latency links. In our tests, this produced speed improvements of 38–61% on connections routing through Secure Core servers compared to standard configurations on equivalent hardware.