It seems that not everyone knows this and it’s well worth knowing.
The default preferences for WMQ Explorer are to show progress dialogs for a minimum of 3 seconds. For example, when deleting a queue there is a progress dialog displayed saying “Deleting the object named MY_QUEUE”. You will always be waiting for 3 seconds before getting the “The object ‘MY_QUEUE’ was deleted successfully” message, even though the command itself was actioned in less than a second.
Given that you just asked for the queue to be deleted you might not want to artificially wait for 3 seconds.
Choose Windows -> Preferences and click on the “WebSphere MQ Explorer” folder to bring up the panel below.
Change the value from 3 to 0.