Tipping in cash requires having enough small bills to make the tip. I remember having to ask for change in small bills or break another $20 to have the right amount for tipping.

Also, the switch to chip chard should mean faster credit card payments. The server brings the terminal, you enter the tip, and then tap or dip your card. That is how it works in Europe and Canada. I hope we can avoid the printing and signing to receipt that happened when I visited London.