I had a bit of an issue regarding performance with the High Sierra and i know it's due to the Beta. But had anyone problems with getting stuck on the loading screen a lot of time? APFS should make the computer faster not slower but as I mentioned my thoughts are that the Beta is the problem. I own a Macbook Pro 13 inch 2016 model and I didn't notice any other big issues. Small issues like slow video loading on Youtube, the login screen is moved to the right when you shut down the Mac and so on. I hope they are going to release a next Beta version in the following weeks. 🙂
Has APFS made your Macbook Pro's slow?
Installed yesterday and have not had any problems to this date. The laptop is noticably faster than Sierra. I have a 2010 Macbook Pro w/2 internal Samsung 850 SSD's. I installed clean on the 2nd drive that wasn't being used and have had no problems. So for me that upgrade was as advertised although I'm sure something is broken somewhere. I am adding my third-party programs one at a time to see if there is any issue. So far so good!