Marko did some investigation, due to the latest AS5 performance complaints on the jboss-dev ml. Due to his results - AbstractMetaDataContext::getComponentMetaDataRetrieval is the biggest hotspot -, I've decided to add caching impls that are part of MDR already, and will work in bootstrap as well. Marko's results on artificial app (100 EJBs, 100 @Local, 100 jsp): | 21% | org.jboss.metadata.plugins.context.AbstractMetaDataContext.getComponentMetaDataRetrieval(Signature) (The method calls itself recursively) | org.jboss.metadata.spi.retrieval.MetaDataRetrievalToMetaDataBridge.getComponentMetaData(Signature) | org.jboss.aop.Advisor.hasJoinPointAnnotation(Class, Signature, String) | org.jboss.aop.Advisor.hasAnnotation(long, Method, String, Class) | org.jboss.aop.Advisor.hasAnnotation(Method, String) | org.jboss.aop.pointcut.MethodMatcher.classMatchesAll(ClassExpression) | | org.jboss.aop.pointcut.MethodMatcher.matchesIdentifier(ASTMethod) | org.jboss.aop.pointcut.MethodMatcher.matches(ASTMethod) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4163486#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...