Customer is using io-pkt-v4-hc -p tcpip forward

My understanding is that they are not needing any of these:
IPv6 
Crypto / IPSec 
802.11 a/b/g WiFi 
Bridging 
GRE / GRF 
Multicast routing 
Multipoint PPP 

Also, the target need not forward packets from one interface to another; only communication between two local processes 
is required over the loopback device.

If they run only "io-pkt-v4" instead of "io-pkt-v4-hc -p tcpip forward" what will be the difference be in CPU usage, if 
any, however minimal? 

thanks
asherk