Performance Impact of Application Packaging in WebLogic 8.1 SP6- EAR vs WAR

We have run into a strange situation.

We recently moved all components of an EAR into a WAR - without changing underlying Weblogic version (8.1 SP6). Immediately after the repackaging, we observed significantly higher CPU utilization on the servers. We have run several tests and based on results so far, our current theory is that differences in inclusion of libraries (APP-INF/lib in EAR & WEB-INF/lib in WAR) is causing this issue.

Anyone else have any experience/war stories/thoughts on trouble-shooting this开发者_JAVA技巧?

Thanks!