I have an iMac (Retina 5K, 27-inch, Late 2014) with a 3TB Fusion drive that I tried updating to Mojave from High Sierra a few weeks ago. On reboot, the system crawled—just a menu drop down in Finder took more than five seconds. Launching a simple application would take several minutes. I rebooted in Single User mode and it seemed maybe marginally quicker but still so slow as to be unusable.
I booted in Recovery mode and ran Disk Utility twice. No change. I reinstalled Mojave (via Recovery); this also didn't help....
Scott, I had the exact same experience. After an update from High Sierra to macOS 10.14.2, I saw the same excruciating slowness ...
I wish I could say the same, Michael, but I'm running macOS 10.14.2 on a fast 2018 MacBook Pro (with a lightning-fast SSD) ... because there's no other option for that laptop, yet I prefer macOS 10.12.6 on a much slower 2015 MacBook Pro. Why?With the release of macOS 10.14.2, I decided to take the plunge and update my 2012 MacBook Pro from High Sierra. After almost a month, I have to admit I've mostly been pleasantly surprised....
- macOS 10.14.2 constantly harasses me to login to iCloud for Messages. I'm not interested, but, incredibly abusively, Apple doesn't let you say "no" or "stop", as far as I can tell. It just keeps harassing you over and over and over. Apple does this elsewhere, as well, constantly harassing to update macOS 10.12, iOS, etc., etc.
- Really gross startup delays are incredibly obnoxious. This is apparently related to some or all of:
- APFS issues/bugs
- T2 issues/bugs
- incompatibility/bugs with the mainstream Samsung T5
- FileVault issues/bugs
- SecureTokens and sysadminctl
- unknown other issues
- The stupid system won't even boot from a clone on a Samsung T5. It also won't boot from a FileVault-encrypted HFS volume.
- There are unresolved bugs in APFS, and I don't know what the details are or how they may manifest, but I'm concerned about possible data corruption (aiming to do more testing).
- There are quite a few hassles/problems/dysfunction with various utilities I rely on. Some of these can be overcome with special new security settings located in obscure places, but I'm still having trouble with others (e.g. SAT SMART Driver).
- I just encountered a "Previous System" folder that I decided to delete to save space (since I don't need any "previous system"), but Apple won't let me delete it, throwing up errors about files I can't delete. (I've tried various command-line and GUI tricks to no avail, after rebooting, etc.)
But, for me, Apple's increasingly intrusive and abusive customer manipulation is the biggest issue, preventing me from understanding what's happening or controlling my own system, and thus forcing reconsideration of the platform for the future and creating very strong motivation to find an alternative (not likely to be WIndows).