Officially spooled up on pace of play.
Another big issue with pace of play is golf balls. Specifically hackers using Pro VI/X or other $50/dz balls even though their game isn't nearly good enough to extract that technology.
Hacker hits in to the woods or water and rather than chalking it up as a lost ball and moving on they're looking all over for it since they're paying for 4-5 lost balls per round.
The lost ball thing is definitely what slows things down the most, at least from what I see playing on public courses where half of the people are wearing t-shirts or jeans. If its in the woods, don't even both going in to look for it. Leave the fishing pole in the car, if its in the water its gone. If you are in play but in the thick stuff, take 30 seconds and if you can't find it, drop that ball you have in your pocket. Nothing infuriates me more than when you see people taking 3 minutes to find a ball in the deep stuff or the woods, including when people in my group do it. Even if they find it, its gonna take that person 3 hacks to get it back to the fairway, slowing things down further.
Like you said, if someone is losing enough balls per round that a $5 ProV1 is worth trying to find each time, probably time to downgrade to some Warriors or Costco brand balls... I am by no means good, and lose plenty of balls myself, but I don't search for balls - drop and keep the round moving.