[jarek]

> I guess Square could be used creatively to solve the processing time problem: a restaurant could hand out mobile devices to all servers and just process customer payments at the table.

Pretty much every even slightly classy restaurant in Canada has mobile POSes the server brings to your table and you use to punch in your credit card PIN (or it prints the receipt for you to sign, if you have an ancient or American card).

It still takes too long and I wish the limit for RFID-authorized transactions was higher so I could tap rather than PIN, but at least the card remains in my sight at all times.