I don't understand why the organizers at ITF keep slowing the courts? Who benefit that? Not the players, the quiality decrease, the spectators cannot watch 6 hours matches - they just don't have so much time, not to mention the serious damages this cost to the bodies of youngsters. It is not the same to play 6 hours on clay and 6 hours on hard court, cause the latter is a lot more damaging...
Just watch a final 10 years back in time when the courts was really fast, and check if it was entertaining. I dont think so, because in many matches it was hardly any rally at all. In one final Sampras played the longest rally was like 6-7 balls. Karlovic who has one of the best serves ever said himself "I think its good they are slower, because otherwise I would have aced all the time"...the guys are that good now with these extreme rackets.
And one of the reasons for the so long game between Nadal and Djokovic is also how extremly long time they take between points, like 30-40 seconds.