Improving EJB Performance
You have already seen some of the important techniques for improving EJB performance. If you reduce the number of interactions between the client and the server, your application should speed up a great deal.
Some of the other areas where you can improve performance are
Increased entity bean and session bean caching
Database connection pooling
Faster database interface libraries
An optimized local call mechanism (one that doesn't use marshalling)
Data caching
Most of these features should be available in a commercial EJB container (and in several excellent open-source ones, for that matter). One of the most important features, one that isn't as common in EJB containers, is data caching.
You might need a commercial CMP engine ...
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