A Queue Processor rule is an internal background process on the server that you can use for queue management and asynchronous processing. You can use standard or dedicated Queue Processor rules.
Queue Processor rules replace standard agents. You can use standard queue processors for simple queue management, or dedicated queue processors for customized or delayed processing of messages. Queue Processor rules support higher scaling throughput than agents. Each queue processor can process messages across 20 partitions, which means that Queue Processor rules can support up to 20 separate processing threads simultaneously with no conflict