When a device gets an "order", it is programmed that the associations are performed at the end of the command, as a result, there can be a few second's delay between triggering the association and the reaction of the associated device. Besides, it depends which association is triggered. Some of them, e.g. association group 4, is triggered only when the level is reported back to the device, because they must send the level to the associated device. Others, e.g. association group 3 - Start Stop Level change, will start immediately after the button is pressed and released.