I have double checked my results.
Just to mention all other things are equal. The difference lies simply in which libraries I use.
I noted a 10 second increasing on a total of 50 seconds when I switched from alfa6 to alfa8.
DEBUG 20-06 19:35:32,937 (KernelFactory.java:assembleNewKernel:86) -Starting JBoss Kernel construction...
DEBUG 20-06 19:35:33,078 (KernelFactory.java:assembleNewKernel:112) -Completed JBoss Kernel construction. Duration: 125 milliseconds
INFO 20-06 19:35:33,078 (EJB3StandaloneBootstrap.java:loadMBeanServer:408) -!!loadMBeanServer servers 0
INFO 20-06 19:35:33,078 (EJB3StandaloneBootstrap.java:loadMBeanServer:411) -!!loadMBeanServer creating...
WARN 20-06 19:35:33,656 (BeanSchemaBinding.java:init:227) -You should use the 2.0 version of the Microcontainer xml. xmlns='urn:jboss:bean-deployer:2.0'
DEBUG 20-06 19:35:33,734 (BeanXMLDeployer.java:deploy:91) -Parsing file:/D:/Eclipse%20Workspaces/SOA_EJB3/CBI_BE/bin/embedded-jboss-beans.xml took 594 milliseconds
DEBUG 20-06 19:35:34,000 (UserTransactionImpl.java:start:61) -new UserTx: org.jboss.ejb3.embedded.UserTransactionImpl@15a3a1
INFO 20-06 19:35:34,078 (LocalTxDataSource.java:bindConnectionFactory:117) -Bound datasource to JNDI name 'java:/cbi_local_tx'
DEBUG 20-06 19:35:34,093 (BeanXMLDeployer.java:deploy:98) -Deploying file:/D:/Eclipse%20Workspaces/SOA_EJB3/CBI_BE/bin/embedded-jboss-beans.xml took 953 milliseconds
DEBUG 20-06 19:36:09,296 (JaccHelper.java:initialiseJacc:61) -Initialising JACC Context for deployment: Cbi
DEBUG 20-06 19:36:09,625 (Ejb3AnnotationHandler.java:getContainers:164) -found EJB3: ...
Watching the log I see that there's a 35 secs stop (cpu at 100%) just after the deploying of embedded-jboss-bean.xml (where there is an accurate time report) and before the JACC initialization.
I'm struggling to understand what those 35 secs are used for, as I think they will increase when increasing bean number. I hope not, because bootstrap can get very delayed.
I'm also thinking to break bean deploying on several pieces respecting dependencies and to load beans on request. But I have to work on it.