EJB and large memory - need expert advise.

Hi,
I have an application that uses alot of memory. There are many clients/session connecting to this application with persistent data.
Memory can be think of 2 parts:
- small portion which is different from one session and another, and needs to be persistent
- large portion, which is shared among clients, and change very infrequently. This is a large and complex data structure.
My problem is to avoid performance hit as much as possible. (very high client request rate).
How do I solve this problem using EJB? I am thinking either entity beans or a combination of entity and stateful session manage bean.
Swaping in and out big chunch of memory is slow. Assemble them back takes a lot of time. I may misunderstand how EJB works though. Could some of you help?
Thank you very much in advance,
VD

Is this an impossible thing to do?

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