As far as I had assumed (don't have any in-depth knowledge though), all chip systems required a challenge response with a server, so this couldn't be batched I

As far as I had assumed (don't have any in-depth knowledge though), all chip systems required a challenge response with a server, so this couldn't be batched I don't think. I can imagine it being related to internet connection speed if it was a minor delay, but people seem to describe really significant delay, even in major US cities where you'd imagine that shouldn't be a problem.