Application startup very slow after bootApple iMac mit Retina 5K Late 2015 Hello, i just got the latest 27" iMac (late 2015) some months ago with smallest Fusion Dri...
Answer to: Application startup very slow after bootSo i called the Apple Service. First off the pixel glitch is reported by many many users in the internet and seems to be a problem from Sierra. Nothing crucial at least. With the Apple Service we deleted and recreated the Fusion Drive. The iMac seems to run very fast now: First we startet Internet Recovery (If i remember right press CMD+R after starting the machine). Then we opened Terminal and deleted the whole Drive including recovery stuff. (1) diskutil cs list -> Copy Logical Volume Group UUID (2) diskutil cs delete <Logical Volume Group UUID> (3) diskutil list -> Copy Logical Volume Group UUID again and find SSD and HDD id's (4) diskutil cs create Macintosh\ hd disk0 disk1 (in my case disk0 = SSD, disk1 = HDD, found in previous step) * diskutil cs createVolume <Logical Volume Group UUID> jhfs+ Macintosh\ hd 100% Then close Terminal and start installing macOS. (In my case only El Capitan was available and i upgraded to Sierra later)
Answer to: Crashing Randomly what could it be?Yes: I sold it on eBay and bought we new one... :/