If the PGA were serious about speeding up the pace of play, there would be fines laid out on every group that takes more than 4.5 hours to complete 18 holes, or every group that winds up holding up the group behind them. The days of 3 groups sitting talking on a tee box because they're backed up "that badly" should have been stopped the very first time it happened.
*Groups that get held up, and in turn, wind up holding up the group behind them wouldn't be fined, of course.