Yeah, it's an absolute disaster. My boot up time takes almost 2 minutes just to get to the screen to type in password to enter the OS and then after that takes another 2 minutes to the point I can start using computer. I noticed dropbox takes forever to start up where on my other computer it boots up just fine. The boot up time is definitely frustrating. I just couldn't believe it and overall it's just sluggish and takes 10 seconds to open a browser or another program and I have a 32gb ram, i7 imac with top video card. I reset SV and VRram and it didn't solve anything. I am very disappointed to say the least. It's embarrassing when windows boots up faster. I also only have one login item and that's dropbox only. I have hardly any extra stuff on my computer. The boot up times from previous version went up 300% to 500%. It's just crazy.