We find any of the CS places to be fast on service, but the waiting on line to order, or the search for a table can take a while. For example, E of S in DTD is one of the fastest for service, but it's so jammed sometimes that the meal there can take as much time as in a TS place.
I've always had really fast service at Casey's even when it's really crowded. If you enter through the doors furthest from Main Street, the lines there are usually shorter.