I think that most people will agree... pace of play is dictated by the group in front of you and not by the group behind you.
Also, I've been playing golf for well over 30 years and have belong to several different clubs. Not one of them had an average anything close to a 4.5 hour round, and if they did, I would not have been a member there.
My final point... I belonged to a club that would ask you to pick up and proceed to the next tee after 2 warnings to pickup the pace. That particular club had the best marshals, and if any paying customers gave the marshals a hard time they would ask the group to leave the course, report to the proshop and receive their refund. They were also told not to return again unless they could keep pace of play. That was 20 years ago... and the club has since been purchased by Club Link.