VPN encryption consumes processor time and adds packet overhead. The reduction depends on the router CPU, encryption algorithm, packet size and number of tunnels. A modem capable of high cellular speed may still deliver much lower encrypted throughput if the router’s processor is the limiting factor.
For low-volume telemetry the impact may be negligible. For 5G, cameras or large file transfers, ask for tested VPN performance rather than assuming the modem’s maximum rate applies. Also consider latency and MTU settings, which can affect application performance. Select a router with enough processing headroom for the required encryption, not only enough radio capacity.
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How much can encryption and VPN processing reduce the usable throughput of an industrial router?
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