The delay parameter specifies how often the events in the queue are checked. This is important because it determines the maximum rate of actions for all events in the queue.
If you specify a queue delay of 0.10 seconds, but an event delay of 0.05 seconds, the event will only be executed every 0.10 seconds. Therefore, the delay should be set to the smallest value required by your events. Values smaller than 0.05 seconds are not recommended.