The queue manager controls how many download tasks can be running simultaneously. By default this number is set to 5 and you very likely won't change it without a reason. If you're still interested in the advanced settings, please keep reading this article.

Keep in mind that you can kick-start an idle task even when the limit has been reached. To do so, select idle task and click the Start button of the toolbar.

In case you need more control, there's a way to have separate queues for each resource1. When enabled, the queue manager starts counting the number of download tasks currently running for one resource. For example, if you set the domain queue length to 2 and add 3 downloads tasks from example.com and one from macpsd.net, the queue manager will start 2 tasks from example.com and the one from macpsd.net. When one of the example.com tasks finished, the queue manager starts the remaining download task from example.com. These words can be summarized in the following table:

Main queue length	Domain queue length	Result
5	TURNED OFF	Not more that 5 simultaneous downloads.
5	2	Not more than 2 simultaneous downloads from one resource. Not more that 5 simultaneous downloads in total.
10	3	Not more than 3 simultaneous downloads from one resource. Not more that 10 simultaneous downloads in total.
2	2	Not more than 2 simultaneous downloads from one resource. Not more that 2 simultaneous download in total. This configuration doesn't make any sense. Domain queue should be disabled.

The queue manager sees example.com and www.example.com as two different resources. Keep on reading if you need to define more extended rules.

This feature is only available in the plus mode and allows to define a separate queue for each resource. The queue can be defined for a particular domain (macpsd.net) or for all sub-domains with a leading asterisk symbol (*.macpsd.net). For example, with this feature you can define a queue for *.macpsd.net and set the limit to 2. This limit will be applied to all downloads from macpsd.net: from www.macpsd.net, macpsd.net and so on.

Main queue length	Domain queue length	Separate queue for *.macpsd.net	Result
5	2	1	Not more that 1 running download from *.macpsd.net. Not more than 2 simultaneous downloads from one resource for others. Not more that 5 simultaneous downloads in total.