I installed Yosemite on my early 2013 iMac yesterday and have mostly been unable to use my account since the install. The first clue that something was wrong was that it took literally 4 minutes to log on to my account. I would type in my password and it would spin and sit there until 4 minutes later when it let me in (I timed it). Then the first time, my dock was flashing for awhile then went away (I do not have it hidden) and everything was painfully slow. Once I finally got my console open I could see the dock was crashing approximately every 40 second. There were some other error messages but they all seemed related to the dock. I first tried to repair disk permissions but that was so slow it wasn't even useful. I tried it last night, then let it run overnight and when I got up it had fixed maybe 10 items (all related to the printer) and said I had 11 hours left. I went to my library/preferences and deleted the dock.plist, then rebooted but that didn't have any effect. But it only seems to be my account. I am now logged on to the guest account and everything seems to be working. I ran the repair disk permissions and it took 2 minutes, found a few things and fixed them. I'm not sure how I can copy the error messages or access them from the guest account in order to paste them here. If I tried to post this message from my account the lag is so bad that it would literally take me at least 45 minutes just to open Safari, open the console, and post a message. Any advice would be greatly appreciated.