In the main, the public conversations on this topic are a repeated distraction and purposeless; I ask why don't you just solve whatever problem you're having at your course, and let us know how you did it. I don't care what the pace of play is at course's I don't play, nor do I care about it on TV where I'm turning on at 3 and know its ending between 6 and 7; that's MY pace of play for watching it...
Moreover to the futility of these outloud redundant conversations, I was a starter/ranger/monitor for 16 of my 42 years in the golf club arena; I have attended to tee times and pace of play intimately and there is no federated solution (of the type I observe in these threads) to your (or is it your course's?) problems that will won't either
a). disaffect the public on whose pleasure the enterprise depends, or...
b) be unacceptable to an existing private culture that must approve such a program...or
c) fail to achieve a meaningful hastening in pace that actually shows up in your public course's bottom line/private satisfaction with operation.
For after all, what is the point of dropping your course's average time from 4 hr 35 min to 4 hr 15 min if that can't be shown to be a specific boon to the operation?...get more people out per day than would before your program?...increase seasonal revenue, adjusted for price changes...?
Anyways, I decided to relate that the only thing that worked for me to better pace sustainability is to have at least two (three is best at a busy, busy public venue, while one can be enough at a private) dedicated staff who are cycling an ever-expanding route from the early holes back to the tee, until the course is filled and they are making continual loops throughout its middle 14 holes.
Just their regular habitual visual presence is a reliable start, but moreover you hope that such staff have a knowledge of the course, and know where those choke points are...and know how to let a group know they are getting behind the course's pace guidelines...and know how to say so in unconfrontational ways...like, "just one or two quick ones, and you can forget about it..." ..and know enough to spot a ball for a player...truly player assist.
Clocks and punishments and time stamping and rules may indeed make strides at some places...as may price incentivizing, rewarding and endorsing fast(er) play... but I realized modest success (average time of 4:22 down to 4:14...and slowest 10% of times to 4:35... from 4:48 (small percentage but huge in private club happiness)) by employing a gentle approach where they felt monitored but unobtrusively. I must mention that my activities were pre-endorsed and well promulgated amongst the members at those places where I handled those duties. So there was a culture launch to companion whatever tactics I deployed.