Synchronous performance issues

Hi all,

We've a scenario that can developed using PI 7.1, but the 90% of interfaces will be synchronous (ATM, Internet Banking accessing SAP Banking functions).

Does anybody have some references, cases to similar scenarios?

I'm thinking about to developer SOAP -> RFC or HTTP -> RFC. The interfaces must be called by Java Clients, somebody have another issue about this scenarios. Any tip about how to get more performance, let me know.

Best regards