I dont have a way to benchmark this but I think its the firewall causing the performance issue. I followed the symantec best practices for Virtual environment guide.Created a new group for Virtual Machines only. Did not setup Insight Cache or Security Virtual Appliance. Therefore used Active scan in policy as per the guide.
I then created a Firewall rule to allow all traffic for all ports for all IP's on my network. Suddenly performance seems normal. This is purely a qualitative finding, I have not performed any benchmarks.
Is there a guide for Firewall best practices for the Virtual Environment with particular reference to vSphere 5.1? I think some blocked-ports causing the issue.
@Brian81 , you mentioned to install AV component only. Can you elaborate on reason why you installed only AV component ?
You also mentioned installing on 2012 "box" did you deploy to VM or baremetal ?