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A few years ago, when we hit with CPS on some big customers intranet scalability problems, we started to use ZAsync in order to perform some tasks in the background. That improved a lot the application overall performance. What ZAsync does is recording in BTrees within the ZODB tasks to perform, let’s say Python scripts to simplify. Then a twisted client that runs independantly opens the ZODB to read the BTree and find the task to perform. It acts like another Zope thread in some ways. But there’s something I never understood: Why the job queue is stored in the ZODB database ?