I was wondering what would be the ideal performance for placing the DMZs on either a physical interface or logical interface. We are using ASA 5550s, the outside is setup on GIG 0/0 and the inside is setup on GIG 1/0 for optimal performance. The ASA 5550 documentation talks about placing the outside and inside on separate PCI bus(s) to achieve maximum performance. They don't mention of having a DMZ on either bus 1 or bus 2. I'm guessing you can place it on the same bus as your inside, since the DMZ talks to the outside for hosting services but you also have a lot of backend applications that needs to communicate to your DMZ.