> For example, proponents of cashless payments often like to claim that paying with cash takes more time than paying with a card, but the opposite is true.

That really depends on the type of cashless payment you are using. EC payment usually takes longer because it involves the process of preparing the reader, having the customer put in his card, wait till the reader is ready, input pin, wait again, done.

But I've also seen contactless card payment with Visa/Mastercard that didn't require any PIN entry/signature, those are surprisingly fast.