SG 4860 - BEST CONFIG OPTIONS FOR OPENVPN PERFORMANCE

[Larrikin]

Hi - I'm looking at picking up a second hand SG 4860 PFSense.

Two questions:

What speeds can I get expect to get from OpenVPN based on the limitations of the CPU on the 4860?

From memory, I recall reading posts (and I cannot find them now no matter how much I search) that there are specific options to enable or disable in the config to achieve the best possible speeds for OpenVPN. Can anyone tell me what they are? Is it something about PowerD or whatever that is? If so, where is that setting and can someone explain it to me where to find it and whether it should be enabled or disabled. And anything else like that related (or PowerD may be nothing to do with it).

Thanks in advance.