We have moved a long way off topic and are now discussing slow play issues. I think that there are a varety of contributors, in the main some players are slow and have a pre shot routine that can add lots of minutes, on the greens some seem to take forever whilst others seem to have the line almost immediately the amount of time taken on the greens should not be understimated. Contoured greens will add lots of time, they make you take three putts afterall,if your doing all the marking and lining up in turns, it can take forever. Walking from greens to the next tee can clock some time if there are long walks, I dont agree with the premise that back tees are always back from the general walk, even on older colders much of the walk is still involved from the forward blocks, if you think of ladies tees they are much forward, are they quicker, are they hell.
Carts and cart paths if you have to stay on them are a definite time adder and if your carrying like in the UK you can mitigate to a lot more direct routing.
Bad etiquete, searching in long rough for balls are other biggies, a half way house stop.
Managing it is important, but its not easy to tell someone off in a nice way, its needs the education to start proir to play really.