I have participated in enough Pathfinder and 4E combats to honestly say that the 4E combats, regardless of group and player composition do take about 3 times as long as Pathfinder combats (at least those I have experienced). You can easily resolve a combat in 30 minutes in Pathfinder, whereas even low level 4E combats can be 1 and half hours long (sometimes longer). Every time I play Pathfinder, I am amazed at how much faster it is to resolve combat than in 4E. I'm sure it has a lot to do with not every monster having an absurd amount of hit points. I also personally know people that can no longer participate in LFR because of the huge time investment playing a mod requires. Once again, it is because of the excessivley long time it takes to resolve combat in 4E. The last few rounds of updates have upset the group of people I occasionaly play LFR with (which is practically never now thanks to excessive combat length and outrage at rules updates) enough to swear off buying any more books and letting their DDI subscriptions lapse. I can't say that I blame them either. I personally find the amount of rules updates, which generally equate to extreme nerfing of formally useful feats, powers, class abilities, and paragon paths, to be seriously offputting. You can believe me or not, but these are in fact my personal experiences with 4E.