If you have a lot of tasks in the queue, because the queue runner selects them in batches of 20 and runs then, it means that you can have lots of tasks that are run before others.
For example, if you're using the Hosting task priority sandbox:
https://www.drupal.org/sandbox/darthsteven/2730949 →
then these won't be respected as quickly as they could be.
Given that finding the next task to run is usually going to be much quicker than actually processing the task, it shouldn't be an issue to select the 'next' task to run in batches of 1, instead of 20.
Put lots of tasks into the queue, have some process by which the order of execution changes fairly dynamically.
Change the select so that the queued only selects 1 task at a time.
Code up the change.
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Fixed
3.0
Code
Issue #3419210 by Steven Jones: Queued can run tasks in a sub-optimal...
Automatically closed - issue fixed for 2 weeks with no activity.