I am running AE 2015.3 and PR 2015.4 on OS X 10.10.5. My system has 64gb RAM. My media lives on 7200RPM drives and the OS + apps live on a PCIe SSD. Hopefully these specs are not at fault here.
I cannot tell if it is a problem with Premiere or AE, but every single time I switch from Premiere to AE, AE grinds to a halt and gives me the pinwheel for several minutes. Drives me off the wall because this problem did not exist with AE 2015.2. Any help or comments would be appreciated.