I have a filled queue of size 10. After some time [processing mdbs] i noticed that there is an interval between the starting times of the mdbs processing; about 2-3 seconds. That is bean 1 starts at time T bean 2 starts at time T + 2 secs bean 3 starts at time T + 4 secs ... I tried to find delay attributes in jboss -service.xml files but could not find any. Does anybody now how I can tell jboss to start the mdbs at the same time (T).