I'm interested in what the etiquette is in various places for a card or group playing through a group ahead of it. In casual play, of course.
What old timers have told me is that if it is decided and agreed that a faster group should play through, then the group ahead throws its drives on the next hole, followed by the second group throwing its drives. Then the second group approaches and putts out while the first group waits. Then the second group finishes.
Is that what happens on your courses?
Now, how to decide who should play through and when is a different story. If there are groups on nearly every hole, it makes no sense - to me - for anyone to play through.
Groups throwing multiple drives or discs, or larger than 4 people, should pretty much be prepared to let anyone through who catches up; when they catch up. IMHO