OpenVPN performance terrible to other machines on server's subnet

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http://serverfault.com – I'm having a lot of trouble getting OpenVPN performance to be what I would expect with my new OpenVPN setup. The network looks like this: Home LAN VPN Clients ( -> Airport Extreme (forwarding OpenVPN port) -> OpenVPN Server (listening on OpenVPN port 1294) -> Home iMac -> NAS Box I am using routing, with the following config file. Routing is set up using IP Masquerading on the OpenVPN server, because I can't create static routes on my gateway, which is an Airport Extreme). Note that CPU usage on the VPN server is minimal throughout all the tests below. Server confi (HowTos)