We have noticed rather significant performance differences between 2.4.0 and 2.4.1.
I will be exploring this more next week but if someone has any ideas of what the differences are it could be very helpful.

The details so far are that a simple lookup of entity beans, basically a findall, runs much faster in 2.4.1, but, many of our beans have a one-to-many relations ship with other beans. Lookups that have one entity bean return all the beans related to it is about 6X slower in 2.4.1 than in 2.4.0.

Like I said I will be doing more testing and src compares next week.

We are building a network management system. Our target platform is Linux and we are using JDK 1.3.1, HSQL and Jboss+tomcat. The one-to-many relationships are that a network switch can hold many cards and each card has ports, and so on.