Hi, I upgraded Sierra with a clean install to High Sierra when it was released. My Macbook 12" 2015 1.3ghz became sluggish as well as the device taking forever to shut down. I ran some speed tests for the SSD and the numbers were about half the normal speed: about 150-200megabyte/s read So I reverted to Sierra and the machine was back to its original speed. I clean installed HS last night and while it has been a long time the same issues are happening: sluggish response and: - very slow shut down of apps when shutting down the machine. - that clock face spinning wheel appears when apps close(as seen on dock) and the screen goes black. it took about 5-10 seconds for each app on the dock to close. these are not big apps: airmail 3, calendra, soulver, tweetbot. - clock spins for 1-2 minutes until mac finally shuts down. a few minutes ago i tried to shut down and the spinning wheel just spun for about 5 minutes before I hit the power button to restart. WHAT IS GOING ON? Is it APFS causing these issues? Is there something I should do with my ssd? I have a Macbook 13" 2011 2.3gh that runs perfectly fine with HS. I just cant seem to get HS to work with Macbook 12"