Online checkin slower than the queue

We were recently in JHB from CPT for the weekend and flew with Mango. We always check in online as it is way more convenient and we do not always have luggage to check in. This time we had a bag to drop and we had to go to be bag drop counter.<br> <br> When we got to the queue there were about 15 people in the normal check in queue and we were 2nd in the bag drop queue. The client at the bag drop queue must have had some problem with his booking and was just standing there. The queue behind us then started to build up, so much so that the normal check in queue was empty and we had not moved. The check in assistants did not then ask for the next customer form the bag drop but proceeded to have their own conversation. Eventually some people moved from the bag drop to check in queue and they were then assisted.<br> <br> It took literally 15 minutes for us to drop our bag off from number 2 in the queue. I don't know why the bag drop service is offered and then there is only one counter open to assist you and it would have been faster just to check in as per normal.<br>