JBoss is slow to start when hosting large amounts of static content or large jars with many files and packages

The logging during this time shows only the following types of "Indexed pkg" TRACE messages:

TRACE [org.jboss.mx.loading.ClassLoaderUtils] Indexed pkg: ROOT.war.images, UCL: org.jboss.mx.loading.UnifiedClassLoader3@1ed54a0{ url=file:/path/to/jboss-as/server/default/deploy/jboss-web.deployer/ ,addedOrder=6}

"main" prio=1 tid=0x081481b8 nid=0x7f74 runnable [0x301ca000..0x301ccfa0]
     at java.io.UnixFileSystem.list(Native Method)
     at java.io.File.list(File.java:937)
     at java.io.File.listFiles(File.java:1093)
     at org.jboss.mx.loading.ClassLoaderUtils$FileIterator.getNextEntry(ClassLoaderUtils.java:501)
     at org.jboss.mx.loading.ClassLoaderUtils$ClassPathIterator.getNextEntry(ClassLoaderUtils.java:618)
     at org.jboss.mx.loading.ClassLoaderUtils.updatePackageMap(ClassLoaderUtils.java:320)
     at org.jboss.mx.loading.ClassLoaderUtils.updatePackageMap(ClassLoaderUtils.java:254)
     at org.jboss.mx.loading.UnifiedLoaderRepository3.updatePackageMap(UnifiedLoaderRepository3.java:813)