OpenVPN performance to PIA running on BT Homehub 5A

I've setup my BT Homehub 5A router running LEDE (Open-WRT) to connect the PIA servers using OpenVPN using AES-128-CBC cipherspec.

I'm seeing that the openvpn process is pegged at about 90% CPU and the overall system CPU is about 40% (therefore two processors I think).

Throughput as shown by speedtest.net is at best about 9.4Mbps when the tunnel is active, while it is about 53Mbps when the VPN is not running.

What can I do to get better performance?   I'm prepared to give up a little security to get better performance.  Would BF-CBC be any faster?

Thanks
Dave
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