If you are loading many web applications which which have the same jars in their WEB-INF/lib then consider moving the shared jars from WEB-INF/lib into the tomcat shared directory ${catalina.home}/shared/lib

This will reduce the memory used by each web app, reduce the size of your your war files, and increase start up time. See http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html

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