We have a par 3 (2nd) following the par 5 1st and its always a bottleneck when busy. As soon as they clear the 2nd there's no problems.
These are public golfers so skill levels vary but its definitely a slow point on the course
Par 3 seconds are almost always a holdup because it's possible to get groups off the first about every seven minutes, but there's no par three I've seen that allows that.
We have a course in Topeka with a an easy par four first folowed by a very short (driveable for some) that causes people all sorts of trouble around the green. On most Sat. mornings when I played there, any time after about 10 a.m. you could count on two or three groups standing on the second tee.
The third is another fairly simple par four followed by a drop-shot par three over a hazard.
On several occasions my group got to the fourth tee having taken more than hour to play three holes.... only to be confronted with another backup. The group ahead of us wasn't even on the tee yet because the people ahead of them were just leaving the tee.
To make matters worse, the fifth is reachable par five with a completely blind second shot.
More than once it took us well over three hours to make the turn. Typically, we'd be able to play the back in under two hours due to the number of nine-hole players and the better layout of the back, pace management wise.