Better pace of play, if it is not a tournament round, tournament rounds take forever, always have, always will, there are some reasons for this, but that is another discussion.
Play the right tees
Play ready golf, this means be in position to play your ball whenever possible. Don't stand there or sit there and watch every shot watch. If you are walking this should be easy. If you are in a cart whenever possible split the distance between balls and walk to your ball.
Use net double bogey, pick up your ball, for those that still might not get this, it is par plus 3
Play everything as a lateral (red) hazard. I think this should be a rule change.
Do not spend a lot of time looking for lost a ball, if you and the rest of your group don't find it right away, take your drop using the lateral hazard rule. Yes, as soon as you play the dropped ball, someone will find your ball.
On and around the green, when you have one player that is way off the green and even though you are on the green or just off, but farthest from the cup, instead of waiting for them to walk all the way to their ball, assess their shot, make their shot, you should go ahead and putt or chip. Whenever possible putt out.