>PSP is intentionally designed to meet the requirements of large-scale data-center traffic. It does not mandate a specific key exchange protocol I take that to

>PSP is intentionally designed to meet the requirements of large-scale data-center traffic. It does not mandate a specific key exchange protocol I take that to mean you do the asymmetric key stuff outside of PSP, then the symmetric key stuff is offloaded to PSP. Assuming you send a lot of data per connection, the symmetric key part will be much larger, so the expensive part is offloaded.