Removed all unused subsystems.  Here's the list of the remaining extensions:

{code}
        <extension module="org.jboss.as.clustering.jgroups"/>
        <extension module="org.jboss.as.clustering.infinispan"/>
        <extension module="org.jboss.as.deployment-scanner"/>
        <extension module="org.jboss.as.ee"/>
        <extension module="org.jboss.as.jaxrs"/>
        <extension module="org.jboss.as.jmx"/>
        <extension module="org.jboss.as.logging"/>
        <extension module="org.jboss.as.naming"/>
        <extension module="org.jboss.as.remoting"/>
        <extension module="org.jboss.as.security"/>
        <extension module="org.jboss.as.threads"/>
        <extension module="org.jboss.as.transactions"/>
        <extension module="org.jboss.as.web" />
        <extension module="org.jboss.datagrid" />
{code}

Startup time in my laptop: 4352ms
(MacBook Pro 2011 / Core i7 2.7GHz / 8GiB RAM / Intel SSD)
I actually didn't notice much speed up after trimming.

Docs QE Status: Removed: NEW