Rules of Golf - Rule 5.6b. Prompt pace of play.
A round of golf is meant to be played at a prompt pace.
Your pace of play is likely to affect how long it will take other players to play their rounds, including both those in your group and those in following groups.
You are encouraged to allow faster groups to play through.
Pace of Play Recommendations.
You should play at a prompt pace throughout the round, including the time taken to:
You should prepare in advance for your next stroke and be ready to play when it is your turn.
Playing Out of Turn to Help Pace of Play (Ready Golf).
In stroke play, play "ready golf" in a safe and responsible way.
In match play, you and your opponent may agree that one of you will play out of turn to save time.
Leading matches have a responsibility to set the pace for the rest of the field.
Make up ground on the match in front of you after playing a short hole.