thought am the only one irritated due to such behaviour.

but my observation is that this habbit is associated with certain nationalities or to be more specific, prevailing withing ertain nationalities. guess such people have no value for time. they do not notice the long queue behind and actually they have been waiting for their turn.

over and above, once the cashier finishes his work, they start looking for and counting money or lookng for a credit card or debit card that has sufficeient balance.