1. play fast
2. don't spend time looking for lost balls
3. play fast
That's all I got. I generally play with one other guy, so we often get paired up with others to form foursomes, and the only thing that drives me nuts is an incredibly slow player.
There is no problem with being crappy. There is nothing you can do with that. But if you are putting for a 7, and taking 2 minutes to read the break, you might have to duck a nine iron that "slipped" out of someones hand.