This may sound silly, given that they are playing in the most famous tournament in the world, but it is important for the game as a whole that the referees do highlight slow play and put players on the clock if they fall too far behind. The general players look at these tournaments and think that it's accetable to spend 3/4 minutes deliberating over shots and golf for the general public becomes a game that really tests your patience. I've played golf with some very casual golfers, high handicappers, like myself, who see nothing wrong with taking 3/4 practice swings, standing back, eyeing the shot again, phantom swinging, adressing the ball for another few practice swings before finally hitting their shot.
It's becomes a very frustrating game.