I will admit I am part of the problem, I play too fast and make everyone else look slow.
I gave up Saturdays when a group of 12 of us into 3*4's played in a maximum 3.30 hrs. The club went to a 2 tee start and made all rounds 4 - 4.45 hours making the fast players play as slow as the slowest players.
My personal belief is that extra time did not result in any better scores for anybody.
When I see players on the 1st tee all playing with their phones it is almost certain the round is going to be slow.