A citation in support of s2scott's comment:
From
Performance Analysis of OpenVPN on a Consumer Grade Router,
http://www.cse.wustl.edu/~jain/cse567-08/ftp/ovpn.pdf:
Quote:
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"The performance of OpenVPN depends on the router hardware, and the configuration parameters. The throughput was found to be limited by the router CPU, and is not sufficient for fast connections such as 10/100 Mbps LANs."
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