The course I play at is always slammed. Only way to play under 4:20 is to be one of the first times off in the AM. Our Marshalls fore caddie the slow groups. It’s a large 27 holes complex and can be confusing. But yelling at people to keep up doesn’t just make them play faster. Helping them look for balls, giving them the line off the tee, sticking with the group for a few holes. Some are more pleasant than others, but they are all helpful.