Hej, I have a problem with my cMP 5,1 (2 x 3,46). If I boot with the opt key it takes up to 4 minutes until the boot options show up. My boot drive is an OWC Mercury Accelsior E2 (latest firmware) which contains two startup disks. But even if I pull the card and try to boot via SATA the behavior remains. I tried several versions of mac OS, right now it's a HFS+ 10.8.5 and a APFS 10.13.6 The mac runs just fine otherwise and I have this issue for quite a while now. I avoided it by selecting the startup disk inside the OS before booting but 10.8.5 is of course not capable of showing an APFS drive nor a High Sierra partition. Any ideas? Thanks a lot!