Every VPN imposes a performance penalty. Encrypting your traffic, routing it through an intermediary server, and decrypting it at the destination all consume time - and that time shows up as slower downloads, lagging uploads, and higher latency. The question is never whether a VPN will slow your connection, but by how much. After more than a decade of structured speed testing, PCMag's latest results show that the performance gap between the best and worst providers is wide enough to matter to ordinary users.