JBoss development, A new message was posted in the thread "CallbackItem.changeCallback() very expensive due to context tracking": http://community.jboss.org/message/527600#527600 Author : Kabir Khan Profile : http://community.jboss.org/people/kabir.khan@jboss.com Message: -------------------------------------------------------------- Changing this to the following works, but maybe we aren't using context tracking in the kernel tests?    public ContextTracker getContextTracker()    {       if (tracker == null || tracker == NOOP)       {          synchronized (this)          {             // since we got through, we must be the same caller             if (tracker == NOOP)                return null;               // we waited, got through, but it's now changed             if (tracker != null && tracker != NOOP)                return tracker;               tracker = NOOP; // mark that we're initializing               ContextTracker ct = null;             MetaData metaData = scopeInfo.getMetaData();             if (metaData != null)             {                ct = metaData.getMetaData(ContextTracker.class); //               if (ct == null) //               { //                  List<ScopeLevel> levels = CommonLevelsUtil.getSubLevels(DEFAULT_MINIMAL); //                  int instanceIndex = levels.indexOf(CommonLevels.INSTANCE); //                  for (int i = instanceIndex; i >= 0 && ct == null; i--) //                  { //                     MetaData md = metaData.getScopeMetaData(levels.get(i)); //                     if (md != null) //                        ct = md.getMetaData(ContextTracker.class); //                  } //               }             }             tracker = ct; // should we care if it's still null?          }       }       return tracker;    } In turn about 60% of the time taken by calling ScopeKey.getScopeLevel(). If the above fix is not ok, I'll need to look at optimizing that. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/527600#527600