Because with the swipe readers there is only one call to the payment processor.
However, with chip transactions there are multiple calls for different payment processing flows. For example, a transaction could require 5 round trip request responses from the chip to the payment process meaning 5x the time required.
However, with chip transactions there are multiple calls for different payment processing flows. For example, a transaction could require 5 round trip request responses from the chip to the payment process meaning 5x the time required.