There are other things you can do besides what is mentioned above, none of which is consistent with traditional routing principles.
The big ones are NOT to combine bridges to save money (which is tempting, but it takes all golfers on a less direct route.)
A course with all par 4's would play the fastest. As would a course with the handicap ratings starting with the most difficult at hole 1, and the 18th being the easiest, theoretically allowing players ahead to get away from the group behind. In addition, holes of equal but different challenges help flow, as opposed to the idea of a rhythm of easy, hard, and medium holes. Rate the tee shot, approach shot, and putting for difficulty, i.e., 1-3, for 9 potential points. All holes should average 6 points, rather than a 4 followed by a 9.
And more practically, make sure the holes after a par 3 are easy to help avoid backups after the par 3. Or, at least make the tee shot wide open.
Honestly, I wasn't aware of many of these ideas until later in my career. But, I used to have a speed of play (or pace) section in my master plan reports where I would look at all those situations (and more) and if there was to be any re-routing, incorporate them there.